DSO4000 Series Digital Storage Oscilloscope User Manual

DSO4000 Series
Digital Storage Oscilloscope
User Manual
（Version 1.3）
Contents
Contents ........................................................................................................................................... i
Safety Tips....................................................................................................................................... 1
General Safety Summary .................................................................................................................... 1
Safety Terms and Symbols .................................................................................................................. 2
Product Scrapping ............................................................................................................................... 2
Brief Introduction to DSO4000 Series ................................................................................................. 3
Chapter 1
1.1
Introduction ............................................................................................................... 4
Accidence of front panel and the user interface ....................................................................... 1
1.1.1
Front Panel ....................................................................................................................... 1
1.1.2
User Interface ................................................................................................................... 2
1.2
Functional Check ...................................................................................................................... 3
1.2.1
Power on the oscilloscope ................................................................................................ 3
1.2.2
Connect the oscilloscope .................................................................................................. 3
1.2.3
Observe the waveform ...................................................................................................... 4
1.3
Probe Examination ................................................................................................................... 4
1.3.1
Safety ................................................................................................................................ 4
1.3.2
Use of Probe Check Wizard ............................................................................................. 5
1.3.3
Manual Probe Compensation ........................................................................................... 5
1.3.4
Probe Attenuation Setting ................................................................................................. 6
1.4
Self Calibration ......................................................................................................................... 6
Chapter 2
Main Feature Description ........................................................................................ 7
2.1
Menu and control keys ............................................................................................................. 7
2.2
Multi-functional Knobs and Buttons .......................................................................................... 8
2.3
Signal Connectors .................................................................................................................... 8
2.4
Oscilloscope Setup ................................................................................................................... 9
2.5
Default setups .......................................................................................................................... 9
2.6
Horizontal System ...................................................................................................................11
2.6.1
Horizontal control knob ................................................................................................... 12
2.6.2
Display Scan mode ......................................................................................................... 14
2.7
Vertical System ....................................................................................................................... 15
2.7.1
Vertical Controls .............................................................................................................. 15
2.7.2
Math FFT ........................................................................................................................ 16
2.8
Trigger System ....................................................................................................................... 22
2.8.1
Trigger Controls .............................................................................................................. 23
2.9
Save/Recall ............................................................................................................................ 29
2.10
Display System ....................................................................................................................... 31
2.10.1
2.11
XY Format ....................................................................................................................... 32
Measure System .................................................................................................................... 32
2.11.1
Scale measurement ........................................................................................................ 32
2.11.2
Cursor measurement ...................................................................................................... 32
2.11.3
Measurement .................................................................................................................. 35
2.12
Acquisition System ................................................................................................................. 37
2.13
UTILITY System ..................................................................................................................... 39
2.13.1
Firmware Update ............................................................................................................ 39
2.13.2
Self Calibration ............................................................................................................... 40
2.13.3
Keypad Beep Control ...................................................................................................... 40
2.13.4
Language ........................................................................................................................ 40
2.13.5
GUI Color Setting ............................................................................................................ 40
2.13.6
Time Setting .................................................................................................................... 40
2.13.7
System Status ................................................................................................................. 40
2.13.8
Pass/fail .......................................................................................................................... 40
2.13.9
Recorder ......................................................................................................................... 42
2.13.10
Filter ............................................................................................................................ 43
2.13.11
Wave ........................................................................................................................... 44
2.13.12
DDS............................................................................................................................. 44
2.13.13
DVM ............................................................................................................................ 44
2.14
Help System ........................................................................................................................... 45
2.15
Fast Action Buttons ................................................................................................................ 46
2.15.1
2.16
Autoset ............................................................................................................................ 46
Waveform Generator .............................................................................................................. 48
2.16.1
Set Wave Type and Parameters ..................................................................................... 48
2.16.2
Edit Arbitrary Waveform .................................................................................................. 48
2.16.3
Output Arbitrary Waveform ............................................................................................. 50
2.17
Power Amplifier(Optional)....................................................................................................... 51
Chapter 3
Application Examples ............................................................................................ 52
3.1
Example 1: Taking Simple Measurements ............................................................................. 53
3.2
Example 2: Taking Cursor Measurements ............................................................................. 54
3.3
Example 3: Analyzing Input Signals to Eliminate Random Noise .......................................... 57
3.4
Example 4: Capturing Single-shot Signal............................................................................... 59
3.5
Example 5: Using X-Y Mode .................................................................................................. 59
3.6
Example 6: Triggering on Pulse Width ................................................................................... 61
3.7
Example 7: Triggering on Video Signal .................................................................................. 62
3.8
Example 8: Using Slope Trigger to Capture Particular Slope Signal ..................................... 63
3.9
Example 9: Using Overtime Trigger to Measure Long Pulse Signal ...................................... 64
3.10
Example 10: Using Math Functions to Analyze Waveforms .................................................. 65
3.11
Example 11: Measuring Data Propagation Delay .................................................................. 66
Chapter 4
4.1
Problem Settlement ................................................................................................................ 68
Chapter 5
5.1
Troubleshooting ..................................................................................................... 68
Specifications ......................................................................................................... 69
Technical Specifications ......................................................................................................... 69
5.2
Accessories ............................................................................................................................ 75
5.3
Open Source Information ....................................................................................................... 75
License: GPLV2
Chapter 6
See Appendix B ................................................................................................ 75
General Care and Cleaning ................................................................................... 76
6.1
General Care .......................................................................................................................... 76
6.2
Cleaning ................................................................................................................................. 76
Appendix A Harmful and Poisonous Substances or Elements ............................................... 77
Appendix B.................................................................................................................................... 78
GNU GENERAL PUBLIC LICENSE .............................................................................................. 78
Version 2, June 1991 .................................................................................................................... 78
Safety Tips
General Safety Summary
Read the following safety precautions to avoid injury and prevent damage to this product or any
products connected to it. To evade potential hazards, use this product only as specified.
Only qualified personnel should perform maintenance.
Avoid fire or personal injury.
Use suitable power cord. Use only the power cord specified for this product and certified for the
country of use.
Connect and disconnect properly. Connect a probe with the oscilloscope before it is connected
to measured circuits; disconnect the probe from the oscilloscope after it is disconnected from
measured circuits.
Ground the product. This product is grounded through the grounding conductor of the power
cord. To avoid electric shock, the grounding conductor must be connected to earth ground. Before
making connections to the input or output terminals of the product, ensure that the product is
properly grounded.
Connect the probe in a right way. The probe ground lead is at ground potential. Do not connect
the ground lead to an elevated voltage.
Check all terminal ratings. To avoid fire or shock hazard, check all ratings and markings on the
product. Refer to the product manual for detailed information about ratings before making
connections to the product.
Do not operate without covers. Do not operate this product with covers or panels removed.
Avoid exposed circuitry. Do not touch exposed connections and components when power is
present.
Do not operate with suspected failures. If you suspect there is damage to this product, have it
inspected by qualified service personnel.
Assure good ventilation.
Do not operate in wet/damp environments.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.
Safety Terms and Symbols
Terms on Product
The following terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the marking.
WARNING indicates an injury hazard not immediately accessible as you read the marking.
CAUTION indicates a possible hazard to this product or other property.
Symbols on Product
The following symbols may appear on the product:
Protective
Ground
(Earth)
Terminal
Measurement
Ground
Terminal
Mains
Disconnected
OFF (Power)
CAUTION
Refer to Manual
Mains
Connected
ON (Power)
Measurement
Input Terminal
High Voltage
Product Scrapping
Device Recycling
We need extract and utilize natural resources to produce this device. If you do not reclaim the
device in a proper way, some substances it contains may become harmful or poisonous to
environments or human bodies. To avoid them being released outside and to minimize the waste
of natural resources, we suggest you reasonably call back this device to ensure proper recovery
and recycling of most materials within it.
Brief Introduction to DSO4000 Series
DSO4000 Series oscilloscopes cover the bandwidths from 70MHz to 200MHz, and provide
the real-time and equivalent sample rates respectively up to 1GSa/s and 25GSa/s. In addition,
they have 7 inch color TFT LCD as well as WINDOWS-style interfaces and menus for easy
operation.
What’s more, the plenty menu information and the easy-to-operate buttons allow you to gain
information as much as possible in measurement; the multifunctional knobs and the powerful
shortcut keys help you save a lot of time in operation; the Autoset function lets you detect sine and
square waves automatically; the Probe Check Wizard guides you to adjust the probe
compensation and set the Probe option attenuation factor. By using the three methods the
oscilloscope provides (context-sensitive, hyperlinks, and an index), you may master all operations
on the device in quite a short time so as to greatly improve your efficiency in production and
development.
Model
Channels
Bandwidth
Sample Rate
LCD
DSO4072
2
70MHz
1GS/s
7 inch color
DSO4102
2
100MHz
1GS/s
7 inch color
DSO4202
2
200MHz
1GS/s
7 inch color
Model List of DSO4000 Series
Chapter 1 Introduction
 Accidence of front panel and the user interface
 Functional Check
 Probe Examination
 Self Calibration
1.1 Accidence of front panel and the user interface
This section will make you understand the front operation panel of this series of digital oscilloscope
at first before use.
1.1.1 Front Panel
The content below simply describes and introduces the front panel and the back part of this series
of digital oscilloscope so that you can get familiar with this series of digital oscilloscope well within
the shortest time.
Figure 1-1 Figure of Front Panel
DSO4000 Series Digital Storage Oscilloscope
1
1.1.2 User Interface
1. Hantek mark
2. Display Format:
: YT
: XY
: Vectors
: Dots
: Gray indicates auto persistence; Green means persistence display is enabled. When
the icon is set to green, the time for persistence display will be shown behind it.
3. Acquisition Mode: Normal, Peak Detect or Average
4. Trigger Status:
The oscilloscope is acquiring pretriggered data.
All pretriggered data have been acquired and the oscilloscope is ready to accept a trigger.
T
The oscilloscope has detected a trigger and is acquiring the posttrigger information.
The oscilloscope works in auto mode and is acquiring waveforms in the absence of triggers.
The oscilloscope is acquiring and displaying waveform data continuously in scan mode.
●
The oscilloscope has stopped acquiring waveform data.
S
The oscilloscope has finished a single sequence acquisition.
5. Tool Icon:
: If this icon lights up, it means the keyboard of the oscilloscope is locked by the host computer
via USB control.
: If this icon lights up, it means the USB disk has been connected.
DSO4000 Series Digital Storage Oscilloscope
2
: This icon lights up only when the USB slave interface is connected with the computer.
6.
7.
8.
9.
10.
11.
12.
Main Time Base Window
Display of window’s position in data memory and data length.
Window Time Base
Operating Menu shows different information for different function keys.
Readout shows frequency count.
Readout points out horizontal waveform position
Trigger Type:
: Edge trigger on the rising edge.
: Edge trigger on the falling edge.
: Video trigger with line synchronization.
: Video trigger with field synchronization.
: Pulse Width trigger, positive polarity.
: Pulse Width trigger, negative polarity.
13.
14.
15.
16.
Pop-up Prompt
Readout tells trigger level.
Icon indicates whether the waveform is inverted or not.
20M Bandwidth Limit. If this icon lights up, it means the bandwidth limit is enabled, otherwise
disabled.
17. Icon indicates channel coupling.
18. Channel Marker
19. Window displays waveform.
1.2 Functional Check
Follow the steps below to perform a quick functional check to your oscilloscope.
1.2.1 Power on the oscilloscope
Plug in the oscilloscope and press the ON/OFF button. Then push the “SAVE/RECALL ->F4”
button to recover DEFAULT setting. The default Probe option attenuation setting is 10X.
1.2.2 Connect the oscilloscope
Set the switch on the probe to 10X and connect the probe to Channel 1 on the oscilloscope. First,
DSO4000 Series Digital Storage Oscilloscope
3
align the slot in the probe connector with the protuberance on the CH1 BNC and push to connect;
then, turn to right to lock the probe in place; after that, connect the probe tip and reference lead to
the PROBE COMP connectors. There is a mark on the panel: Probe COMP ~5V@1KHz.
CH1: to connect with the probe
PROBE COMP
1.2.3 Observe the waveform
Press the AUTOSET button and you should see within a few seconds a square wave of about 5V
peak-to-peak at 1kHz in the display. Press the CH1 MENU button twice to remove Channel 1.
Push the CH2 MENU button and repeat Step 2 and Step 3 to observe Channel 2.
1.3 Probe Examination
1.3.1 Safety
When using the probe, keep your fingers behind the guard on the probe body to avoid electric
shock. Do not touch metallic portions of the probe head while it is connected to a voltage source.
Connect the probe to the oscilloscope and connect the ground terminal to ground before you start
any measurements.
DSO4000 Series Digital Storage Oscilloscope
4
1.3.2 Use of Probe Check Wizard
Every time you connect a probe to an input channel, you should use the probe check wizard to
verify that this probe is operating correctly.
Use the vertical menu (for example, push the CH1 MENU button) to set the Probe option
attenuation factor.
1.3.3 Manual Probe Compensation
Upon the first connection of a probe and an input channel, you should manually perform this
adjustment to match the probe to the input channel. Uncompensated or miscompensated probes
may lead to errors or faults in measurement. To adjust the probe compensation, follow the steps
below.
1. Set the Probe option attenuation in the channel menu to 10X. Set the switch on the probe to
10X and connect the probe to Channel 1 on the oscilloscope. If you use the probe hook-tip,
ensure it is firmly inserted onto the probe. Attach the probe tip to the PROBE COMP
~5V@1KHz connector and the reference lead to the PROBE COMP Ground connector.
Display the channel and then press the AUTOSET button.
2. Check the shape of the displayed waveform.
Compensated correctly
Overcompensated
Undercompensated
3. If necessary, use a nonmetallic screwdriver to adjust the variable capacity of your probe until
the shape of the waveform turns to be the same as the above figure. Repeat this step as
necessary. See the figure below for the way of adjustment.
DSO4000 Series Digital Storage Oscilloscope
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1.3.4 Probe Attenuation Setting
Probes are of various attenuation factors which affect the vertical scale of the signal. The Probe
Check function is used to verify if the Probe attenuation option matches the attenuation of the
probe.
As an alternative method to Probe Check, you can push a vertical menu button (such as the CH 1
MENU button) and select the Probe option that matches the attenuation factor of your probe.
Make sure that the Attenuation switch on the probe matches the Probe option in the oscilloscope.
Switch settings are 1X and 10X.
When the Attenuation switch is set to 1X, the probe limits the bandwidth of the oscilloscope to
6MHz. To use the full bandwidth of the oscilloscope, be sure to set the switch to 10X.
1.4 Self Calibration
The self calibration routine helps optimize the oscilloscope signal path for maximum measurement
accuracy. You can run the routine at any time but should always run it if the ambient temperature
changes by 5℃ or more. For a more accurate calibration, please power on the oscilloscope and
wait for 20 minutes until it has adequately warmed up.
To compensate the signal path, disconnect any probes or cables from the front-panel input
connectors. Then, push the UTILITY button, select the Do Self Cal option and follow the directions
on the screen.
DSO4000 Series Digital Storage Oscilloscope
6
Basic Operation
Chapter 2 Main Feature Description
This chapter provides some general information that you need to learn before using an
oscilloscope. It contains:

Menu and Control Keys

Multi-functional Knobs and Buttons

Signal Connectors

Oscilloscope Setup

Default Setups

Default Setups

Horizontal System

Vertical System

Trigger System

Save and Recal

Display Syetem

Measure System

Acquisition System

Utility System

Help System

Fast Action Buttons

Waveform Generator

Power Amplifier(optional)
Basic Operation
2.1 Menu and control keys
As shown in the figure below:
Figure2-1 Control keys
All the keys are described as follows:

[CH1], [CH2]: display setup menus of channel 1 and channel 2.

[MATH]: display “ARITHMETICAL OPERATION” and “REFERENCE WAVEFORM” menu.

[HORIZ]: display “HORIZONTAL” menu.

[TRIG]: display “TRIGGER” control menu.

[FORCE TRIG]: It is used for finishing acquisition of the current waveform no matter whether
the oscilloscope detects trigger, and it is mainly applied to “NORMAL” and “SINGLE” in the
trigger mode.

[SAVE/RECALL]: display the “SAVE/RECALL” menu of setups and waveform.

[MEASURE]: display the “MEASURE” menu.

[ACQUIRE]: display the “ACQUIRE” menu.

[UTILITY]: display “UTILITY FUNCTION” menu.

[CURSOR]: display the “CURSOR” menu. The [V0] knob can be used for regulating the
position of the cursor when the “CURSOR” menu is displayed and the cursor is triggered.

[DISPLAY]: show the “DISPLAY” menu.

[HELP]: enter the on-line help system.

[AUTOSET]: automatically set the control state of the oscilloscope so as to display suitable
waveform.

[RUN/STOP]: continuously acquire waveform or stop acquisition

[SINGLE SEQ]: Acquire a single trigger, finish acquisition and then stop.

[GEN DSO]: Waveform generator output button..

[GEN ON/GEN OFF]: Power Amplifier output button.
DSO4000 Series Digital Storage Oscilloscope
7
Basic Operation
2.2 Multi-functional Knobs and Buttons
V0: Multi-functional knob. Under different menu options, it supports selecting menu
options (MEASURE), moving cursors and levels (Slope Trigger).
Press this knob to reset data (trigger holdoff, overtime of the overtime trigger and
slope trigger), select menu
options and so on. Easy to operate.
F7: Push this button in single-window mode to switch between dotted line display
and cross display. Push it in dual-window mode to perform autocruise.
F0: Hide/Show button. Push it to hide the menu options on the right side of the
screen and give a full screen display of waveforms. Push it again to show the menu
options.
F1-F5: These five buttons are all multi-functional. They are in charge of selecting
corresponding menu options on the screen in different menu modes. For example, in
the UTILITY menu, F1-F5 respectively correspond to ‘System Info’ – ‘Advance’.
F6: This functional button is mainly used to turn pages and confirm a selection, such
as ‘next page’, ‘previous page’, and ‘press F6 to confirm’ appearing when you push
Self Calibration option.
2.3 Signal Connectors
See the figure below to find the seven signals connectors and a pair of metal electrodes at the
bottom of the oscilloscope panel.
1.
GEN OUT: Waveform Signal Output.
DSO4000 Series Digital Storage Oscilloscope
8
Basic Operation
2.
SYNC/TRIG: Output the Sync signal, or input trigger signal on DDS interface.
3.
CH1, CH2: Input connectors for waveform display, through which to connect and input the
signal to be measured.
4.
GEN AMP: Power amplifier output.
5.
EXT.TRIG: Input connector for an external trigger source, though with to connect and input
the external trigger signal.
6.
Probe Compensation: Voltage probe compensation output and ground, used to electrically
match the probe to the oscilloscope input circuit. The probe compensation ground and BNC
shields connect to earth ground and are considered to be ground terminals. To avoid
damages, do not connect a voltage source to any of these ground terminals.
2.4 Oscilloscope Setup
While operating the oscilloscope, you may often use three features: Autoset, saving a setup and
recalling a setup. Hereinafter they are introduced one by one.
Autoset: This function can be used to adjust the horizontal and vertical scales of the oscilloscope
automatically and set the trigger coupling, type, position, slope, level and mode, etc., to acquire a
stable waveform display.
Saving a Setup: By default, the oscilloscope will save the setup each time before being closed,
and automatically recall the setup once being turned on. (Note: If you modify the setup, please
wait for more than 5 seconds before turning off the oscilloscope to ensure the proper
storage of new settings.) You can save 10 settings permanently in the oscilloscope and reset
them as necessary.
Recalling a Setup: The oscilloscope can recall any of your saved setups or the default factory
setup.
Default Setup: The oscilloscope is preset for normal operations when it is shipped from the
factory. This is the default setup. You may recall this setup at any time for your requirements.
2.5 Default setups
The default setups represent some option parameters that are set before the oscilloscope leaves
factory for normal operations.
When you push “UTILITY->Default” button, the oscilloscope will display the CH1 waveform and
remove all the others. The table below gives the options, buttons and controls that change settings
at default setup.
Menu or System
Acquire
Option, Button or Knob
(Three mode options)
Default Setting
Normal
Averages
16
Run/Stop
Run
DSO4000 Series Digital Storage Oscilloscope
9
Basic Operation
Cursor
Display
Horizontal
Math
Type
Off
Source
CH1
Horizontal (amplitude)
±3.2div
Vertical (time)
±4div
Type
Vectors
Persist
Off
Format
YT
Window Mode
Single-window
Trigger Knob
Level
Position
0.00s
SEC/DIV
200μs
Operation
—
Source
CH1-CH2
Position
0div
Vertical Scale
20dB
FFT Operation
FFT
Measure
Trigger (Edge)
Trigger (Video)
Trigger (Pulse)
Trigger (Slope)
Source
CH1
Window
Hanning
FFT Zoom
X1
Source
CH1
Type
None
Type
Edge
Source
CH1
Slope
Rising
Mode
Auto
Coupling
DC
Level
0.00v
Polarity
Normal
Sync
All lines
Standard
NTSC
When
=
Set Pulse Width
1.00ms
Polarity
Positive
Mode
Auto
Coupling
DC
Slope
Rising
Mode
Auto
Coupling
DC
When
=
CH1
Trigger (Swap)
Type
Edge
Slope
Rising
Mode
Auto
DSO4000 Series Digital Storage Oscilloscope
10
Basic Operation
Coupling
DC
Level
0.00v
CH2
Trigger (OT)
Vertical System,
All Channels
Type
Edge
Slope
Rising
Mode
Auto
Coupling
DC
Level
0.00v
Source
CH1
Polarity
Positive
Mode
Auto
Time
20ns
Coupling
DC
Bandwidth Limit
Unlimited
VOLTS/DIV
Coarse
Probe
Voltage
Voltage Probe Attenuation
10X
Invert
Off
Position
0.00div (0.00V)
VOLTS/DIV
1.00V
The following settings do not change when you push the DEFAULT SETUP button.





Language Option
Saved Settings
Saved Reference Waveforms
Display Contrast
Calibration Data
2.6 Horizontal System
Use the horizontal controls to change the horizontal scale and position of waveforms. The
horizontal position readout shows the time represented by the center of the screen, using the
trigger time as zero. When you change the horizontal scale, the waveform will expand or contract
to the screen center. The readout near the upper right of the screen shows the current horizontal
position in second. W indicates ‘Window Time Base’. The oscilloscope also has an arrow icon at
the top of the graticule to indicate the horizontal position.
DSO4000 Series Digital Storage Oscilloscope
11
Basic Operation
HORIZONTAL POSITION Knob
SEC/DIV
2.6.1 Horizontal control knob
The horizontal knob [SEC/DIV] changes the horizontal scale (time base), and the [POSITION]
knob changes the horizontal position (triggered displacement) triggered in the internal memory.
The center of the screen in the horizontal direction is a time reference point of the waveform.
Change of the horizontal scale will cause expansion or contraction of the waveform relative to the
center of the screen, while the change of the horizontal position is relative to the position of a
trigger point.
Horizontal POSITION knob
1. Regulate the horizontal position (trigger the position relative to the center of the display screen)
of the waveform (including MATH). The resolution of this control knob is changed according to
the time base.
2. Use the press down function of this knob to make the horizontal displacement return to zero,
namely back to the central position of the screen.
[SEC/DIV] knob
1. The knob is used for changing the horizontal time scale so as to conveniently observe the most
suitable waveform.
2. The knob is used for regulating the main time base. When the window expansion mode is
adopted, the knob is used for changing the expansion time base so as to change the window
width.
Each option in HORIZ MENU is described as follows.
Press [SEC/DIV] key to display the horizontal menu “HORI MENU”, and window expansion can be
implemented at this menu.
Options
Settings
Comments
Window
Control
Major Window
Minor Window
Selects the major or minor window in dual-window mode. The
window is highlighted once selected. Press this option button
in single-window mode to enter the daul-window mode.
Mark
Right arrow
Left arrow
Set/Clear
Clear All
This function is usable only in dual-window mode. It sets
marks at some waveform record locations that users are
interested in, and searches for these marks by right and left
arrows. Then it positions the window to this mark for further
observation.
DSO4000 Series Digital Storage Oscilloscope
12
Basic Operation
Page2/2
None
Select this menu and turn the multi-functional knob to adjust
the trigger holdoff time within the range of 100ns-10s. Select
this menu and push the multi-functional knob to reset the
holdoff time with the starting value 100ns.
Autoplay
None
This function is usable in dual-window mode. Push this menu
button and auto move it from left to right at a specified speed.
In the expanded window will display corresponding
waveforms until it stops once reaching the rightmost side of
the major scan window.
Time/Div
Coarse
Fine
Horiz
Position
Coarse
Fine
Holdoff
Window expansion
Window expansion is used for amplifying a segment of waveform so as to check details. The
window expansion time base setup cannot be slower than the setup of the main time base. In the
window expansion region, a selection region can be moved leftwards and rightwards by the
horizontal [POSITION] knob or enlarged and reduced by revolving the [SEC/DIV] knob. The
window expansion time base has higher resolution relative to the main time base. The smaller the
window expansion time base is, the higher the horizontal expansion multiple of the waveform is.
Carry out the following steps to observe details of local waveform:
1. Press [HORI MENU] to display the “HORIZON” menu.
2. Press “Window Ctr” menu.
3. Revolve [SEC/DIV] (to regulate the size of the window) and the horizontal [POSITION] (to
regulate the position of the window) to select the window of the waveform to be observed. The
expansion time base cannot be slower than the main time base.
Press the “Minor Window” button after the window is setting well.
DSO4000 Series Digital Storage Oscilloscope
13
Basic Operation
Single-window Mode
Dual-window Mode (Full Screen)
Location of expanded window data in memory
Major Window
Minor Window
(Expanded Window)
Notes:
1. For more information of the trigger holdoff, see Trigger Controls.
2. In single-window mode, press F0 to hide or show the menus on the right side. The
dual-window mode does not support the menu hiding function.
2.6.2 Display Scan mode
When the time base is set to be 80ms/div or more slowly and the trigger mode is set to “Auto”, the
oscilloscope enters the scan mode. At this mode, waveform display is renewed from left to right. At
the mode, no waveform trigger or horizontal position control exist. The channel coupling should be
set as direct current when a low-frequency signal is observed at the scan mode.
DSO4000 Series Digital Storage Oscilloscope
14
Basic Operation
2.7 Vertical System
2.7.1 Vertical Controls
Vertical controls can be used to display and remove waveforms, adjust vertical scale and position,
set input parameters and perform math calculations. Each channel has a separate vertical menu
to set. See below for menu description.
VERTICAL POSITION Knob
VOLT/DIV Knob
1. VERTICAL POSITION Knob
Move the channel waveform up and down on the screen. In dual-window mode, move the
waveforms in both windows at the same time in a same direction. Push this knob to return
waveforms to the vertical center position on the screen. Two channels correspond to two knobs.
2. VOLT/DIV Knob
Control the oscilloscope to magnify or attenuate the source signal of the channel waveform. The
vertical size of the display on the screen will change (increase or decrease) to the ground level.
Also you may use this knob to switch between coarse and fine.
3. Menu (CH1, CH2): Display vertical menu options; turn on or off the display of channel
waveforms.
Options
Settings
Comments
Coupling
DC
AC
Ground
DC passes both DC and AC components of the input signal.
AC blocks the DC component of the input signal and
attenuates signals below 10Hz.
Ground disconnects the input signal.
20MHz Bandwidth
Limit
Unlimited
Limited
Limits the bandwidth to reduce display noise; filters the
signal to eliminate noise and other unnecessary HF
components.
VOLTS/DIV
Coarse
Fine
Selects the resolution of the VOLTS/DIV knob.
Coarse defines a 1-2-5 sequence. Fine changes the
resolution to small steps between the Coarse settings.
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Basic Operation
Probe Attenuation
1X
10X
100X
1000X
Selects a value according to the probe attenuation factor so
as to ensure correct vertical readouts. Reduce bandwidth to
6MHz when using a 1X probe.
Invert
Off
On
Inverts the waveform relative to the reference level.
Coupling

If the channel adopts a DC coupling mode, you can quickly measure the DC component of the
signal by observing the difference between the waveform and the signal ground.

If the channel adopts an AC coupling mode, the DC component in the signal is filtered. By this
mode, the AC component of the signal is displayed at a higher sensitivity.

If the channel adopts a GND coupling mode, cut off the input signal. Inside the channel, the
channel input is connected with a zero volt reference electric level.
Fine Resolution
In the fine resolution setting, the vertical scale readout displays the actual VOLTS/DIV setting. The
vertical scale changes only after you adjust the VOLTS/DIV control and set to coarse.
Remove Waveform Display
To remove a waveform from the screen, first push the menu button to display the vertical menu,
then push again to remove the waveform. A channel waveform which is unnecessary to be
displayed can be used as a trigger source or for math operations.
4. MATH MENU: Display the waveform math operations. See the table below for details.
The MATH menu contains source options for all math operations.
Operations
Source Options
Comments
＋
CH1+CH2
Add Channel 1 to Channel 2.
CH1-CH2
Subtract the Channel 2 waveform from the Channel 1
waveform.
CH2-CH1
Subtract the Channel 1 waveform from the Channel 2
waveform.
CH1xCH2
Channel 1 multiply channel 2
CH1/CH2
Channel 1 divide channel 2
CH2/CH1
Channel 2 divide channel 1
－
X
/
FFT
CH1 or CH2
Three types of window available for selection: Hanning,
Flattop, Rectangular.
Zoom: Use the FFT Zoom button to adjust the window size.
Scale: x1, x2, x5, x10.
Note: All selected menus are highlighted in orange.
2.7.2 Math FFT
This chapter elaborates how to use the Math FFT (Fast Fourier Transform). You can use the Math
DSO4000 Series Digital Storage Oscilloscope
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Basic Operation
FFT mode to convert a time-domain (YT) signal into its frequency components (spectrum), and to
observe the following types of signals:





Analyze harmonics in power cords;
Measure harmonic content and distortion in systems;
Characterize noise in DC power supplies;
Test impulse response of filters and systems;
Analyze vibration.
To use the Math FFT mode, perform the following tasks:






Set the source (time-domain) waveform;
Display the FFT spectrum;
Choose a type of FFT window;
Adjust the sample rate to display the fundamental frequency and harmonics without aliasing;
Use zoom controls to magnify the spectrum;
Use cursors to measure the spectrum.
2.7.2.1 Setting Time-domain Waveform
It is necessary to set the time-domain (YT) waveform before using the FFT mode. Follow the steps
below.
1. Push the AUTOSET button to display a YT waveform.
2. Turn the VERTICAL POSITION knob to vertically move the YT waveform to the center (zero
division) so as to ensure the FFT will display a true DC value.
3. Turn the HORIZONTAL POSITION knob to position the part of the YT waveform to be
analyzed in the center eight divisions of the screen. The oscilloscope uses the 2048 center
points of the time-domain waveform to calculate the FFT spectrum.
4. Turn the VOLTS/DIV knob to ensure the entire waveform remains on the screen. If the entire
waveform is invisible, the oscilloscope may display wrong FFT results by adding
high-frequency components.
5. Turn the SEC/DIV knob to provide the resolution you need in the FFT spectrum.
6. If possible, set the oscilloscope to display multiple signal cycles.
If you turn the SEC/DIV knob to select a faster setting (fewer cycles), the FFT spectrum will display
a larger frequency range and reduce the possibility of FFT aliasing.
To set the FFT display, follow the steps below.
1. Push the MATH MENU button;
2. Set the Operation option to FFT;
3. Select the Math FFT Source channel.
In many situations, the oscilloscope can also generate a useful FFT spectrum despite the YT
DSO4000 Series Digital Storage Oscilloscope
17
Basic Operation
waveform not being triggered. This is especially true if the signal is periodic or random (such as
noise).
Note: You should trigger and position transient or burst waveforms as close as possible to
the screen center.
Nyquist Frequency
The highest frequency that any real-time digital oscilloscope can measure without errors is half of
the sample rate, which is called the Nyquist frequency. Frequency information beyond the Nyquist
frequency is undersampled which brings about the FFT aliasing. The math function can convert
the center 2048 points of the time-domain waveform to an FFT spectrum. The resulting FFT
spectrum contains 1024 points from DC (0Hz) to the Nyquist frequency. Usually, the screen
compresses the FFT spectrum horizontally to 250 points, but you can use the FFT Zoom function
to expand the FFT spectrum so that you can clearly view the frequency components at each of the
1024 data points in the FFT spectrum.
Note: The oscilloscope’s vertical response is a little bit larger than its bandwidth (70MHz,
100MHz or 200MHz, depending on the model; or 20MHz when the Bandwidth Limit option is
set to Limited). Therefore, the FFT spectrum can display valid frequency information above
the oscilloscope bandwidth. However, the amplitude information near or above the
bandwidth will not be accurate.
2.7.2.2 Displaying FFT Spectrum
Push the MATH MENU button to display the Math menu. Use the options to select the Source
channel, the Window algorithm and the FFT Zoom factor. Only one FFT spectrum can be
displayed at a time.
Math FFT Options
Settings
Comments
Source
CH1, CH2
Choose a channel to be the FFT source.
Window
Hanning, Flattop,
Rectangular
Select a type of the FFT window. For more
information, refer to Section 2.7.2.3.
X1, X2, X5, X10
Change the horizontal magnification of the FFT
display. For detailed information, refer to Section
2.7.2.6.
FFT Zoom
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Basic Operation
1
Fundamental frequency component
Frequency component
5
2
3
4
1. Frequency at the center graticule line
2. Vertical scale in dB per division (0dB=1VRMS)
3. Horizontal scale in frequency per division
4. Sample rate in number of samples per second
5. FFT window type
2.7.2.3 Selecting FFT Window
Using windows can eliminate the spectral leakage in the FFT spectrum. The FFT algorithm
assumes that the YT waveform repeats all the time. When the number of cycles is integral (1, 2,
3 ...), the YT waveform starts and ends at the same amplitude and there are no discontinuities in
the signal shape.
If the number of cycles is nonintegral, the YT waveform starts and ends at different amplitudes and
transitions between the start and end points will cause discontinuities in the signal that introduces
high-frequency transients.
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Basic Operation
Applying a window to the YT waveform changes the waveform so that the start and stop values
are close to each other, which reduces the discontinuities.
The Math FFT function has three FFT Window options. There is a trade-off between frequency
resolution and amplitude accuracy for each type of window. You shall determine which one to
choose according to the object you want to measure and the source signal characteristics.
Window
Hanning
Flattop
Rectangular
Measurement
Periodic
Waveform
Periodic
Waveform
Pulse or Transient
Waveform
Characteristics
Better frequency, poorer amplitude accuracy than Flattop
Better amplitude, poorer frequency accuracy than Hanning
Special-purpose window applicable to discontinuous
waveforms. This is actually the same as no windows.
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Basic Operation
2.7.2.4 FFT Aliasing
Problems occur when the time-domain waveform acquired by the oscilloscope contains frequency
components higher than the Nyquist frequency. The frequency components above the Nyquist
frequency will be undersampled and displayed as lower frequency components that ‘fold back’
from the Nyquist frequency. These erroneous components are called aliases.
2.7.2.5 Eliminating Aliases
To eliminate aliases, use the following methods.





Turn the SEC/DIV knob to set a faster sample rate. Because the Nyquist frequency increases
as you increase the sample rate, the aliased frequency components will be displayed correct.
If too many frequency components appear on the screen, you may use the FFT Zoom option
to magnify the FFT spectrum.
If there is no need to observe the frequency components above 20MHz, set the Bandwidth
Limit option to Limited.
Filter the signal input from outside and limit the bandwidth of the source waveform to lower
than the Nyquist frequency.
Identify and ignore the aliased frequencies.
Use zoom controls and cursors to magnify and measure the FFT spectrum.
2.7.2.6 Magnifying and Positioning FFT Spectrum
You may scale the FFT spectrum and use cursors to measure it through the FFT Zoom option
which enables the horizontal magnification. To vertically magnify the spectrum, use the vertical
controls.
Horizontal Zoom and Position
You can use the FFT Zoom option to magnify the FFT spectrum horizontally without changing the
sample rate. The available zoom factors are X1(default), X2, X5 and X10. When the zoom factor is
set to X1 and the waveform is located at the center graticule, the left graticule line is at 0Hz and
the right is at the Nyquist frequency.
You magnify the FFT spectrum to the center graticule line when you change the zoom factor. That
is, the axis for horizontal magnification is the center graticule line. Turn the Horizontal Position
knob clockwise to move the FFT spectrum to the right. Push the SET TO ZERO button to position
the center spectrum at the center of the graticule.
Vertical Zoom and Position
When the FFT spectrum is being displayed, the channel vertical knobs become the zoom and
position controls corresponding to their respective channels. The VOLTS/DIV knob provides the
following zoom factors: X1(default), X2, X5 and X10. The FFT spectrum is magnified vertically to
the marker M (math waveform reference point on the left edge of the screen). Turn the VERTICAL
POSITION knob clockwise to move up the spectrum.
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Basic Operation
2.7.2.7 Using Cursors to Measure FFT Spectrum
You may use cursors to take two measurements on the FFT spectrum: amplitude (in dB) and
frequency (in Hz). Amplitude is referenced to 0db that equals 1VRMS here. You may use cursors
to measure at any zoom factor.
Push the CURSOR button, choose the Source option and then select Math. Press the Type option
button to select between Amplitude and Frequency. Click the SELECT CURSOR option to choose
a cursor. Then use the V0 knobs to move Cursor S and Cursor E. Use the horizontal cursor to
measure the amplitude and the vertical cursor to measure the frequency. Now the display at the
DELTA menu is just the measured value, and the values at Cursor S and Cursor E.
Delta is the absolute value of Cursor S minus Cursor E.
Frequency Cursors
Amplitude Cursors
2.8 Trigger System
The trigger determines when the oscilloscope begins to acquire data and display a waveform.
Once a trigger is properly set up, the oscilloscope can convert unstable displays or blank screens
to meaningful waveforms. Here introduce some basic concepts about trigger.
Trigger Source: The trigger can be generated with multiple sources. The most common one is the
input channel (alternative between CH1 and CH2). Whether the input signal is displayed or not, it
can trigger normal operations. Also the trigger source can be any signal connected to an external
trigger channel or the AC power line (only for Edge triggers). The source with the AC power line
shows the frequency relationship between the signal and the AC commercial power.
Trigger Type: The oscilloscope has six types of triggers: Edge, Video, Pulse Width, Slope,
Overtime and Swap.

Edge Trigger uses the analog or digital test circuits for triggering. It happens when the
input trigger source crosses a specified level in a specified direction.

Video Trigger performs a field or line trigger through standard video signals.

Pulse Width Trigger can trigger normal or abnormal pulses that meet trigger conditions.
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Basic Operation

Slope Trigger uses the rise and fall times on the edge of signal for triggering.

Overtime Trigger happens after the edge of signal reaches the set time.

Swap Trigger, as a feature of analog oscilloscopes, gives stable displays of signals at
two different frequencies. Mainly it uses a specific frequency to switch between two
analog channels CH1 and CH2 so that the channels will generate swap trigger signals
through the trigger circuitry.
Trigger Mode: You can select the Auto or Normal mode to define how the oscilloscope acquires
data when it does not detect a trigger condition. Auto Mode performs the acquisition freely in
absence of valid trigger. It allows the generation of untriggered waveforms with the time base set
to 80ms/div or slower. Normal Mode updates the displayed waveforms only when the
oscilloscope detects a valid trigger condition. Before this update, the oscilloscope still displays the
old waveforms. This mode shall be used when you want to only view the effectively triggered
waveforms. In this mode, the oscilloscope displays waveforms only after the first trigger. To
perform a single sequence acquisition, push the SINGLE SEQ button.
Trigger Coupling: Trigger Coupling determines which part of the signal will be delivered to the
trigger circuit. This can help to obtain a stable display of the waveform. To use trigger coupling,
push the TRIG MENU button, select an Edge or Pulse trigger, and then select a Coupling option.
Trigger Position: The horizontal position control establishes the time between the trigger position
and the screen center.
Slope and Level: The Slope and Level controls help to define the trigger. The Slope option
determines whether the trigger point is on the rising or falling edge of a signal. To perform the
trigger slope control, press the TRIG MENU button, select an Edge trigger, and use the Slope
button to select rising or falling. The TRIGGER LEVEL knob controls the trigger point is on which
position of the edge.
Trigger level can be
adjusted vertically
Rising Edge Falling Edge
Trigger slope can be rising or falling
2.8.1 Trigger Controls
The trigger can be defined through the Trigger Menu and front-panel controls. There are six types
of trigger: Edge, Video, Pulse Width, Swap, Slope and Overtime. Refer to the following tables to
find a different set of options for each type of trigger.
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Basic Operation
1. Level
It sets the amplitude level the signal must cross to cause an acquisition when using the Edge or
Pulse Width trigger.
2. Set to 50%
The trigger level is set to the vertical midpoint between the peaks of the trigger signal.
3. Force Trigger
Be used to complete an acquisition regardless of an adequate trigger signal. This button becomes
useless if the acquisition is already stopped.
4. TRIG MENU
Push this button to display trigger menus. The edge trigger is in common use. See the table below
for details.
Options
Settings
Comments
Trigger Type
Edge Video
By default the oscilloscope uses the edge trigger which triggers
Pulse Slope
the oscilloscope on the rising or falling edge of the
Swap Overtime
input signal when it crosses the trigger level (threshold).
Select the input source as the trigger signal.
CH1, CH2: No matter the waveform is displayed or not, a
Source
CH1
certain channel will be triggered.
CH2
EXT: Does not display the trigger signal and allows a trigger
EXT
level range of +1.6V to -1.6V.
EXT/5
AC Line
EXT/5: Same as EXT option, but attenuates the signal by a
factor of 5 and allows a trigger level range of +8V to -8V.
AC Line: Uses a signal derived from the power cord as the
trigger source.
Mode
Auto
Normal
Select a trigger mode.
By default, the oscilloscope uses the Auto mode. In this mode,
the oscilloscope is forced to trigger when it does not detect a
DSO4000 Series Digital Storage Oscilloscope
24
Basic Operation
trigger within a certain amount of time based on the SEC/DIV
setting. The oscilloscope goes into the scan mode at 80ms/div
or slower time base settings.
In the Normal mode, the oscilloscope updates the display only
when it detects a valid trigger condition. New waveforms are not
displayed until they replace old ones. Use this mode to just view
valid triggered waveforms. Only after the first trigger does the
AC
Coupling
DC
HF Reject
LF Reject
display appear.
Select the components of the trigger signal applied to the trigger
circuitry.
AC: Blocks DC components and attenuates signals below
10Hz.
DC: Passes all components of the signal.
HF Reject: Attenuates the high-frequency components above
80kHz.
LF Reject: Blocks DC components and attenuates the
low-frequency components below 8kHz.
NOTE: Trigger coupling only affects the signal passed through the trigger system. It does
not affect the bandwidth or coupling of the signal displayed on the screen.
Video Trigger
Options
Settings
Comments
With Video highlighted, an NTSC, PAL or SECAM standard
video signal will be triggered. The trigger coupling is preset to
AC.
Video
Source
CH1
CH2
EXT
EXT/5
Polarity
Normal
Inverted
Sync
All Lines
Line Number
Odd Field
Even Field
All Fields
Choose a proper video sync. When selecting Line Number for
the Sync option, you may use the User Select knob to specify a
line number.
Standard
NTSC
PAL/SECAM
Choose a video standard for sync and line number count.
Select the input source as the trigger signal. Ext and Ext/5 use
the signal applied to the EXT TRIG connector as the source.
Normal: Triggers on the negative edge of the sync pulse.
Inverted: Triggers on the positive edge of the sync pulse.
Note: When you choose Normal Polarity, the trigger always occurs on negative-going sync
pulses. If the video signal contains positive-going sync pulses, use the Inverted Polarity
option.
Pulse Width Trigger
You can use it to trigger on aberrant pulses.
DSO4000 Series Digital Storage Oscilloscope
25
Basic Operation
Options
Settings
Comments
With Pulse highlighted, the trigger occurs on pulses that meet
the trigger condition (defined by the Source, When and Set
Pulse Width options).
Pulse
Source
When
Set
Pulse
Width
Polarity
Mode
CH1
CH2
EXT
EXT5
=
≠
<
>
20ns
Select the input source as the trigger signal.
Select the trigger condition.
to
10.0sec
With Set Pulse Width highlighted by pressing F4, turn the
multi-functional knob to set the pulse width.
Positive
Select to trigger on positive or negative pulses.
Negative
Auto
Select the type of trigger. The Normal mode is best for most
Normal
pulse width trigger applications.
AC
Coupling
DC
Select the components of the trigger signal applied to the
HF Reject
trigger circuit.
LF Reject
More
Switch between submenu pages.
Trigger When: The pulse width of the source must be ≥5ns so that the oscilloscope can detect the
pulse.
Triggers when pulse is
less than width setting
Triggers when pulse is
greater than width setting
Threshold level
Triggers when pulse is not
equal to width setting ±5%
Triggers when pulse is
equal to width setting ±5%
Threshold level
Tolerance
= Trigger Point
Tolerance
＝, ≠: Within a ±5% tolerance, triggers the oscilloscope when the signal pulse width is equal to
or not equal to the specified pulse width.
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26
Basic Operation
＜, ＞: Triggers the oscilloscope when the source signal pulse width is less than or greater
than the specified pulse width.
Slope Trigger: Judges trigger according to the time for rising or falling, more flexible and accurate
than the Edge trigger.
Options
Settings
Comments
Slope
Source
CH1
CH2
EXT
EXT5
Select the input source as the trigger signal.
Slope
Rising
Falling
Select the slope type of signal.
Mode
Auto
Normal
Select the type of trigger. The Normal mode is best for
most pulse width trigger applications.
Coupling
AC
DC
Noise Reject
HF Reject
LF Reject
Selects the components of the trigger signal applied to
the trigger circuitry.
Next Page
V1
V2
=
≠
<
>
Vertical
When
Time
Adjust the vertical window by setting two trigger levels.
Select this option and press F3 to choose V1 or V2.
Select the trigger condition.
With this option highlighted by pressing F4, turn the
multi-functional knob to set the time span.
20ns to 10.0sec
Swap Trigger: As a feature of analog oscilloscopes, it gives stable displays of signals at two
different frequencies. Mainly it uses a specific frequency to switch between two analog channels
CH1 and CH2 so that the channels will generate swap trigger signals through the trigger circuitry.
Options
Settings
Comments
Swap
Trigger
Mode
Auto
Normal
Channel
CH1
CH2
Select the type of trigger.
Push an option such as CH1, select the channel trigger
type and set the menu interface.
Below list options in submenus. Swap Trigger allows CH1 and CH2 to select different trigger
modes and to display waveforms on a same screen. That is, both channels can choose the
following four trigger modes.
Type
Edge
Slope
Rising
Falling
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Basic Operation
Coupling
Type
Polarity
Standard
Sync
Type
Polarity
When
AC
DC
HF Reject
LF Reject
Push F3 or F4 to select the components of the trigger signal
applied to the trigger circuitry.
Video
Normal
Inverted
NTSC
PAL/SECAM
All Lines
Line Number
Odd Field
Even Field
All Fields
Pulse
Positive
Negative
=
≠
<
>
Select by F4, F5.
Select by F3.
Set Pulse
Width
Pulse Width
Push F4 to select. Adjust the multi-functional knob V0 to set
the pulse width.
Coupling
AC
DC
Noise Reject
HF Reject
LF Reject
Select by F5.
Type
Slope
Slope
Rising
Falling
Select the slope type of signal.
Mode
Auto
Normal
Select the type of trigger. The Normal mode is best for most
pulse width trigger applications.
Coupling
AC
DC
Noise Reject
HF Reject
LF Reject
Selects the components of the trigger signal applied to the
trigger circuitry.
Vertical
V1
V2
Adjust the vertical window by setting two trigger levels.
Select this option and press F3 to choose V1 or V2.
When
=
≠
<
>
Time
20ns to 10.0sec
Select the trigger condition.
Press F4 to select this option. Turn the multi-functional
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28
Basic Operation
knob to set the time span.
Overtime Trigger: In Pulse Width trigger, you may sometimes be puzzled with the long time for
trigger, as you do not need a complete pulse width to trigger the oscilloscope, but want the trigger
occurs just upon the overtime point. This is called Overtime Trigger.
Options
Settings
Comments
Type
OT
Source
CH1
CH2
Polarity
Positive
Negative
Mode
Auto
Normal
Overtime

Press F5 to select Overtime option and adjust V0 to set the
time.
Coupling
AC
DC
HF Reject
LF Reject
Selects the components of the trigger signal applied to the
trigger circuitry.
Select the trigger source.
Select to trigger on positive or negative pulses.
Holdoff: To use Trigger Holdoff, push the HORIZONTAL Menu button and set the Holdoff Time
option by pressing F4. The Trigger Holdoff function can be used to generate a stable display of
complex waveforms (such as pulse trains). Holdoff is the time between when the oscilloscope
detects one trigger and when it is ready to detect another. During the holdoff time, the oscilloscope
will not trigger. For a pulse train, the holdoff time can be adjusted to let the oscilloscope trigger only
on the first pulse in the train.
Acquisition Interval
Acquisition Interval
Trigger Level
Indicates
Trigger Points
Holdoff
Holdoff
2.9 Save/Recall
Press the SAVE/RECALL button to save or recall oscilloscope setups or waveforms.
The first page shows the following menu.
Options
Settings
REF
Source
Comments
REF is used as a reference waveform. The format is custom.
CH1
CH2
Select a waveform source to store.
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29
Basic Operation
MATH
RefA
RefB
Select the reference location to store or recall a waveform.
Save
Save the source waveform to the selected reference location.
Recall
Recall saved source waveform to the selected reference location.
Close
Close Ref channel.
Location
Operation
Page 2/2
Media
Back
Options
Flash
Save the source waveform to flash.
USB
Save the source waveform to USB device.
SD
Save the source waveform to SD card.
Return to main menu.
Settings
Setup
Storage
Comments
The oscilloscope settings.
Local Memory
Store the current setups to the USB disk or the memory of the
USB
oscilloscope.
Specify the memory location in which to store the current
Location
0 to 9
waveform settings or from which to recall the waveform settings.
Use the F2 or F3 button to select.
Save
Operation
Complete the saving operation.
Recall the oscilloscope settings stored in the location selected in
Recall
the Setup field. Push the Default Setup button to initialize the
oscilloscope to a known setup.
Back
Options
Return to main menu.
Settings
The table for recording the voltage of each point.
CSV
Source
Operation
File List
Back
Options
Default
Comments
CH1
CH2
Select a waveform source to store.
Save
Save waveform data as .CSV file to USB disk.
Recall
Recall the saved .CSV file stored in USB disk.
Delete
Delete .CSV file stored in USB disk.
Close
Close file list.
Open
Open file list.
Return to main menu.
Settings
Comments
Push the Default softkey to initialize the oscilloscope to a known
setup. Please refer to Default Setup.
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30
Basic Operation
See below for waveform menus.
The white waveforms on the menu is
the recalled RefA waveform
At most 9 groups of
setups can be stored
Note: The oscilloscope will save the current settings if you wait 5 seconds after the last
modification, and it will recall these settings the next time you power on the oscilloscope.
2.10 Display System
[DISPLAY] is a function key of the display system.
Page 1 of the display system function menu:
Option
Type
Setup
Vector
Dots
Description
The sampling points are displayed in a link line manner.
No interpolation link line is displayed between the sampling points.
Display sample points directly
Auto, 0.2s
0.4s, 0.8s
Persist
1.0s,2.0s
4.0s、8.0s
Set the maintained display time length of each displayed sampling
point.
∞
Format
YT
YT format shows the vertical voltage in relation to time (horizontal
XY
scale); XY format displays a dot between CH1 and CH2 each time
0-15 16 ranks adjustable, with a progress bar to display; Press F5 to
Contrast
select this option. Turn the multi-functional knob to adjust.
Page 1/2
Skip to the next page.
Page 2 of the display system function menu:
Option
Grid
Grid
Intensity
Setup
Dotted line
Real line
Off
Description
Only horizontal coordinate and vertical coordinate in the middle of the
level will display on the screen when grid is off.
0-15 16 ranks adjustable, with a progress bar to display
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Basic Operation
Refresh
Rate
Wave
Intensity
Auto, 30 frame, 40 frame, 50frame
0-15 16 ranks adjustable, with a progress bar to display
2.10.1 XY Format
The XY format is used to analyze phase differences, such as those represented by Lissajous
patterns. The format plots the voltage on CH1 against the voltage on CH2, where CH1 is the
horizontal axis and CH2 is the vertical axis. The oscilloscope uses the untriggered Normal
acquisition mode and displays data as dots. The sampling rate is fixed at 1 MS/s.
The oscilloscope can acquire waveforms in YT format at any sampling rate. You may view the
same waveform in XY format. To perform this operation, stop the acquisition and change the
display format to XY.
The table below shows how to operate some controls in XY format.
Controls
Usable or not in XY format
CH1
VOLTS/DIV
POSITION controls
and
VERTICAL
CH2
VOLTS/DIV
POSITION controls
and
VERTICAL
Set the horizontal scale and position
Continuously set the vertical scale and position
Reference or Math
Unusable
Cursors
Unusable
Autoset (display format reset to YT)
Unusable
Time base controls
Unusable
Trigger controls
Unusable
2.11 Measure System
The oscilloscope can use scale and cursor for measurement or automatic measurement, so that
users can fully understand the measured signals.
2.11.1 Scale measurement
By using the method, estimation can be made quickly and intuitively. For instance, waveform
amplitude can be observed, and a probable measurement result is judged according to the vertical
scale. The method realizes simple measurement by multiplying the vertical scale number of the
signal with the vertical gear Volt/div.
2.11.2 Cursor measurement
[CURSORS] is a function key for cursor measurement.
The cursor measurement includes two modes: Manual mode and Tracking mode.
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Basic Operation
1. Manual mode:
Horizontal cursors or vertical cursors appear in pair to measure time or voltage, and the distance
between the cursors can be manually regulated. The signal source should be set as a waveform to
be measured before the cursors are used.
2. Tracking mode:
A horizontal cursor is intersected with a vertical cursor to form a cross cursor. The cross cursor is
automatically located on the waveform, and the horizontal position of the cross cursor on the
waveform is regulated by selecting “Cur A” or “Cur B” and rotating the [UNIVERSAL] knob. The
coordinates of the cursor point will be displayed on the screen of the oscilloscope.
Manual cursor measurement mode
Manual cursor measurement function menu:
Option
Setup
Description
Cursor mode
Manual
Set the manual cursor measurement
Voltage
Manually use the cursor to measure voltage parameters.
Types
Time
CH1
Manually use the cursor to measure time parameters.
Select the input channel of the measured signal.
CH2
Signal sources
MATH
REF A
REF B
S
Cursor select
Select the option using the [UNIVERSAL] knob to regulate
the position of “S”.
E
Select the option using the [UNIVERSAL] knob to regulate
the position of “E”.
The manual cursor measurement mode is used for measuring the coordinate values and
increments of one pair of horizontal or vertical cursors. Ensure the signal source to be set rightly
when using the cursors, as shown in figure 2-38.
■ Voltage cursor: The voltage cursor appears on the display screen as a horizontal line, and it
can be used for measuring vertical parameters.
■ Time cursor: The time cursor appears on the display screen as a vertical line, and it can be
used for measuring horizontal parameters.
■ Cursor movement: Select the cursors first and use the [UNIVERSAL] knob to move cursor A
and cursor B, wherein the values of the cursors will appear on the right upper corner of the screen
during movement.
The operation steps are as follows:
1. Press [CURSORS] to skip to the “CURSOR” menu.
2. Press “Type” to select “Voltage” or “Time”.
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Basic Operation
3. Press “Signal source” to select CH1, CH2, MATH, RefA or RefB.
4. Select “S” and revolve the [UNIVERSAL] knob to regulate the position of “S”.
5. Select “E” and revolve the [UNIVERSAL] knob to regulate the position of “E”.
6. The measurement value list on the menu button “F5”
Cursor tracking measurement mode
Cursor tracking function menu:
Option
Setup
Description
Cursor mode
Tracking
Set the tracking cursor measurement.
CH1
CH2
MATH
RefA
RefB
Source
“S”
Select Cursor
“E”
Select a waveform source to take the cursor measurement.
Select the option using the [UNIVERSAL] knob to regulate the
position of “S”.
Select the option using the [UNIVERSAL] knob to regulate the
position of “E”.
At cursor tracking measurement mode, the cross cursors are displayed on the measured
waveform, the cursors are automatically located on the waveform by moving the horizontal
position between the cursors, and simultaneously the horizontal and vertical coordinates of the
current located point, and the horizontal and vertical increments between the two cursors are
displayed. The horizontal coordinate is displayed as a time value, and the vertical coordinate is
displayed as a voltage value, as shown in figure 2-39.
The operation steps are as follows:
1. Press [CURSORS] to skip to the “CURSOR” menu.
2. Select “Cursor type” as “Tracking”.
3. Press “S”, and select the input channel CH1 or CH2 of the tracked signal.
4. Press “E”, and select the input channel CH1 or CH2 of the tracked signal.
5. Press “S”, and rotate the [UNIVERSAL] knob to horizontally move “S”.
6. Press “E”, and rotate the [UNIVERSAL] knob to horizontally move “E”.
7. The measurement value list on the menu button “F5”
S→T: Position (namely the time based on the horizontal central position) of “S” in the horizontal
direction.
S→V: Position (namely the voltage based on the grounded point of the channel) of “S” in the
vertical direction.
E→T: Position (namely the time based on the horizontal central position) of “E” in the horizontal
direction.
E→V: Position (namely the voltage based on the grounded point of the channel) of “E” in the
vertical direction.
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Basic Operation
dt: Horizontal distance (namely the time value between the two cursors) of “S” and “E”.
1/dt: Frequency of “S” and “E”.
dV: Vertical distance (namely the voltage value between the two cursors) of “S” and “E”.
Voltage Cursor
Time Cursor
2.11.3 Measurement
Push the MEASURE button to perform auto measurements. There are 32 types of measurements
and up to 8 can be displayed at a time.
Turn the V0 knob to select an unspecified option. Press V0 or F6 when the red arrow icon stops on
it. Then the following menu appears.
Use the knob V0 or the functional keys to select the type of measurement. Measurement setting is
described as shown in table:
Options
Source
Settings
CH1
CH2
Comments
Select the measure source.
Measurement Type
1
Frequency
Calculate the waveform frequency by measuring the first cycle.
2
Period
Calculate the time of the first cycle.
3
Mean
Calculate the arithmetic mean voltage over the entire waveform.
4
Pk-Pk
Calculate the absolute difference between the greatest and the
smallest peaks of the entire waveform.
5
CRMS
Calculate the Root Mean Square voltage over the entire waveform.
6
PRMS
Calculate the actual RMS measurement of the first complete cycle in
the waveform.
7
Min
The most negative peak voltage measured over the entire
waveform.
8
Max
The most positive peak voltage measured over the entire waveform.
9
Rising
Measure the time between 10% and 90% of the first rising edge of
the waveform.
10
Falling
Measure the time between 90% and 10% of the first falling edge of
the waveform.
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Basic Operation
11
+ Width
Measure the time between the first rising edge and the next falling
edge at the waveform 50% level.
12
- Width
Measure the time between the first falling edge and the next rising
edge at the waveform 50% level.
13
+ Duty
Measure the first cycle waveform. Positive Duty Cycle is the ratio
between positive pulse width and period.
14
- Duty
Measure the first cycle waveform. Negative Duty Cycle is the ratio
between positive pulse width and period.
15
Base
Measure the highest voltage over the entire waveform.
16
Top
Measure the lowest voltage over the entire waveform.
17
Middle
Measure the voltage of the 50% level from base to top.
18
Amplitude
Voltage between Vtop and Vbase of a waveform.
19
Overshoot
Defined as (Base - Min)/Amp x 100 %, Measured over the entire
waveform.
20
Preshoot
Defined as (Max - Top)/Amp x 100 %, Measured over the entire
waveform.
21
PMean
Calculate the arithmetic mean voltage over the first cycle in the
waveform.
22
FOVShoot
Defined as (Vmin-Vlow)/Vamp after the waveform falling.
23
RPRESoot
Defined as (Vmin-Vlow)/Vamp before the waveform falling.
24
BWidth
The duration of a burst measured over the entire waveform.
25
Delay 1-2 ↑
The time between the first rising edge of source 1 and the first rising
edge of source 2.
26
Delay 1-2 ↓
The time between the first falling edge of source 1 and the first
falling edge of source 2.
27
LFF
The time between the first falling edge of source 1 and the last
falling edge of source 2.
28
LFR
The time between the first falling edge of source 1 and the last rising
edge of source 2.
29
LRF
The time between the first rising edge of source 1 and the last falling
edge of source 2.
30
LRR
The time between the first rising edge of source 1 and the last
rising edge of source 2.
31
FFR
The time between the first falling edge of source 1 and the first
rising edge of source 2.
32
FRF
The time between the first rising edge of source 1 and the first
falling edge of source 2.
Off
Do not take any measurement.
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Basic Operation
Use the knob V0 or the functional keys F3, F4 to select the type of measurement.
The readouts in big font size on
the menu are just results of the
corresponding measurements.
Taking Measurements: For a single waveform (or a waveform divided among multiple
waveforms), up to 8 automatic measurements can be displayed at a time. The waveform channel
must stay in an ‘ON’ (displayed) state to facilitate the measurement. The automatic measurement
can not be performed on reference or math waveforms, or in XY or Scan mode.
2.12 Acquisition System
Push the ACQUIRE button to set the acquisition parameter.
Options
Settings
Comments
Type
Real Time
Equ-Time
Mode
(Real Time)
Normal
Peak Detect
Average
Acquire and accurately display most waveforms.
Detect glitches and eliminate the possibility of aliasing.
Reduce random or uncorrelated noise in signal display.
The number of averages is selectable.
Averages
(Real Time)
4, 8, 16, 32
64, 128
Select the number of averages by pressing F3 or F4.
Memory Depth
(Real Time)
4K, 20K, 40K
Select the memory depth for different board models.
Acquire waveforms by real-time digital technique.
Rebuild waveforms by equivalent sample technique.
Normal: For the oscilloscope model with the bandwidth of 100MHz, the maximum sample rate is
1GS/s. For time base with insufficient sample rate, you may use the Sine Interpolation Algorithm to
interpolate points between sampled points to produce a complete waveform record (4K by
default).
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Basic Operation
Normal Acquisition Intervals
1
2
3
4
5
6
7
8
9
10
Sample Points
Normal Mode Acquires a Single Sample Point in Each Interval
Peak Detect: Use this mode to detect glitches within 10ns and to limit the possibility of aliasing.
This mode is valid at the SEC/DIV setting of 4µs/div or slower. Once you set the SEC/DIV setting
to 4µs/div or faster, the acquisition mode will change to Normal because the sample rate is fast
enough that Peak Detect is unnecessary. The oscilloscope does not display a message to tell you
that the mode has been changed to Normal.
Average: Use this mode to reduce random or uncorrelated noise in the signal to be displayed.
Acquire data in Normal mode and then average a great number of waveforms. Choose the
number of acquisitions (4, 16, 64 or 128) to average for the waveform.
Stopping the Acquisition: When you are running the acquisition, the waveform display is live.
Stop the acquisition (press the RUN/STOP button) to freeze the display. In either mode, the
waveform display can be scaled or positioned by vertical and horizontal controls.
Equivalent Acquisition: Just repeat the Normal acquisition. Use this mode to take a specific
observation on repeatedly displayed periodic signals. You can get a resolution of 40ps, i.e.
25GSa/s sample rate, which is much higher than that obtained in real-time acquisition.
The acquisition principle is as follows.
Input repeated signals
First Acquisition
Second Acquisition
Third Acquisition
Fourth Acquisition
As shown above, acquire input signals (cycle repeatable) for more than once at a slow sample rate,
arrange the sample points by the time they appear, then recover waveforms.
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Basic Operation
2.13 UTILITY System
Push the UTILITY button to display the Utility Menu as follows.
Options
Comments
System Info
Display the software and hardware versions, serial number and some other
information about the oscilloscope.
Update Program
Insert a USB disk with upgrade program and the disk icon at the top left
corner is highlighted. Press the Update Program button and the Software
Upgrade dialog pops up. Push F6 to upgrade or push F2 to cancel.
Save Waveform
Feature Select (CH1 POSITION): position and screenshots.
Position: Push this knob to return CH1 waveforms to the vertical center
position on the screen.
Screenshots: Insert a USB disk and the disk icon at the top left corner is
highlighted. Push this knob and you can see the waveform pause for a
while, being saved. You can find the saved waveform data under the
pic_x_x folder in the USB disk. Here X represents how many times you
press the button. Each press generates a corresponding folder. For
example, press once and a folder pic_1_1 is generated; press twice and two
folders pic_1_1, pic_1_2 are generated.
Self Calibration
Press this option and the Self Calibration dialog pops up. Press F6 to
perform the self calibration. Press F4 to cancel.
Keepad Beep
Turn on or turn off key beep.
GUI Language
Set the language
GUI color
Set the GUI color, bule, black, green, pink, yellow.
Time
Set the time setting.
Sys Status
Display the system status.
Pass/Fail
Pass/Fail function
Recorder
Turn on record function.
Filter
Filter setting.
Print Cfg
Set print configuration
Option
Bode Assiant:
Wave: Save waveform as .hws file to Flash, SD or USB device.
DDS: Enable waveform generator function.
DVM:
Tip: Press any menu button on the front panel to remove the status display and enter a
corresponding menu.
2.13.1 Firmware Update
This series of oscilloscope can upgrade the software by the USB flash disc, which needs about 5
minutes.
The firmware is upgraded by the following steps:
1. Plug the USB flash disc in which a firmware program is saved in USB Host interface
DSO4000 Series Digital Storage Oscilloscope
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Basic Operation
on the front panel of the oscilloscope.
2. Press [UTILITY] to skip to the “UTILITY” menu.
3. Press “Firmware Update”.
4. Refer to Upgrade dialog and push F6 to upgrade.
Reboot the machine after finishing upgrading, and the software version is upgraded. The
oscilloscope should be self-corrected once after upgrading.
2.13.2 Self Calibration
The self calibration routine helps optimize the oscilloscope signal path for maximum measurement
accuracy. You can run the routine at any time but should always run it if the ambient temperature
changes by 5℃ or more. For a more accurate calibration, please power on the oscilloscope and
wait for 20 minutes until it has adequately warmed up.
To compensate the signal path, disconnect any probes or cables from the front-panel input
connectors. Then, push the UTILITY button, select the Do Self Cal option and follow the directions
on the screen.
2.13.3 Keypad Beep Control
Press “Utility->F6” to page 2 of utility menu to select “Keypad Beep”. Press “F1” button to activate
or deactivate it.
2.13.4 Language
This series oscilloscope is equipped with several languages. User can select a language.
To choose the display language, press "UTILITY" button, then press “F6” to utility menu. Press
"F2" to switch language.
2.13.5 GUI Color Setting
This series oscilloscope is equipped with several GUI styles. User can select a style.
Press “Utility” button and “F6” button to page 2 of utility menu. Then press “F2” button to change
GUI color style.
2.13.6 Time Setting
Press “Utility->F6” to page 2 of utility menu to select “Time”. Press “F4” button to set system time.
2.13.7 System Status
Press “Utility->F6” to page 2 of utility menu to select “Sys Status”. Users can know system status
on screen.
2.13.8 Pass/fail
“Pass/fail” is used for judging whether the input signal is in a built rule range and outputting the
past or failed waveform so as to detect the change condition of the signal.
Page 1 of the pass/fail function menu:
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40
Basic Operation
Option
Enable Test
Source
Operation
Display
information
Setup
Run
Stop
CH1
CH2
Run
Stop
Off
On
Page 1/2
Description
Run the pass/fail function.
Stop the pass/fail function.
Select the signal input channel.
Run pass/fail
Stop pass/fail
Close waveform pass/fail time display information.
Open waveform pass/fail time display information.
Skip to page 2 to the pass/fail menu.
Page 2 of the pass/fail function menu:
Option
Output
Stop on
Output
Rule setup
Page 2/2
Setup
Pass
Fail
Pass Ring
Fail Ring
On
Off
Description
Output a negative pulse train when the test is passed.
Output a negative pulse train when the test is failed.
Output a negative pulse train when the test is passed and rings.
Output a negative pulse train when the test is failed and rings.
Enter STOP state if output exits.
Continue to run if output exits.
Skip to a rule setup menu.
Back to t page 1 to the pass/fail menu.
Rule setup menu:
Option
Setup
Vertical
Horizontal
Operation
Create
Save
Back
Description
Use the [UNIVERSAL] knob to set a horizontal tolerance range:
0.020div-4.00div.
Use the [UNIVERSAL] knob to set a vertical tolerance range:
0.025div-8.00div.
Create a rule template according to the two setups above.
Select a save position for the rule.
Back to page 2 of the pass/fail menu.
Rule save menu:
Option
Storage
Location
Operation
Back
Setup
Local Memory
USB Flash
0-9
Save
Recall
Description
Select location of saved rule
Save the rule setups.
Recall the waved rule setups.
Back to page of the rule setup menu.
Pass/Fail output
The pass/fail function can be used for outputting a negative pulse train through a Pass/Fail BNC
interface on a rear panel of the oscilloscope.
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Basic Operation
Pass/Fail Test result
Waveform recording
2.13.9 Recorder
The waveform recording function can be used for recording waveforms input by channel 1 and
channel 2. The user can set the time interval of the frames within 1ms-999s. At most 1000 frames
of waveforms can be recorded. The waveforms can be replayed after being recorded.
Waveform recording: Record the waveforms at a specified time interval until reaching the set end
frame number.
Waveform recording function menu:
Option
Function
Source
Time interval
End Frame
Operation
Setup
Off
Record
Play
Save
CH1
CH2
1ms-999s
1-1000
Start
Stop
Description
Set a recording function menu.
Set a replay function menu.
Set a recording signal source.
Set the time interval for waveform recording.
Set the Max. frame number of recording
Start to record the waveform.
Stop recording the waveform.
As shown in figure 2-57, the operation steps of waveform recording are as follows:
1. Press [UTILITY] to skip to the [UTILITY] menu.
2. Press “F6” to skip to page 3 of the utility menu.
3. Press “Recorder” to skip to the “RECORD” menu.
4. Press the “Function” key to select “Record”.
5. Press the “Source” key to select the signal channel to be recorded.
6. Select the “Time interval” option, and use the [V0] knob to regulate the time interval of frame to
frame in waveform recording.
7. Select the “End frame” option, and use the [V0] knob to regulate the maximal frame number in
the waveform recording.
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Basic Operation
8. Press the “Operation” option “Start” to record the waveform.
Recording replay: Replay the current recorded waveforms.
Page 1 of the waveform replay function menu:
Option
Setup
Description
Function
Play
Set a replay function menu.
Repeat
Repeatedly replay the recorded waveform.
Single
Replay the recorded waveform in single run.
Mode
Time interval
Set the time interval of the replayed frame to frame.
Start frame
Set start frame of playing
End frame
Set end frame of playing
Page 1/2
Skip to page 2 of play menu
Page 2 of the waveform replay function menu:
Option
Setup
Description
Current Frame
Start
Start to replay waveform
Operation
Stop
Stop to reply waveform
Page 2/2
Back to page 1 of the replay function menu.
2.13.10 Filter
Press “Utility->F6->F6” to page 3 of utility menu to select “Filter”. Press “F3” button to select filter
type Low Pass, High Pass, Band Pass or Band Stop.
Low Pass
Source: Select a waveform source to filter.
Up: Set the upper limit of the cutoff frequency.
All the signals from 0Hz to the upper limit of cut-off frequency can be passed. And other signals will
be limited.
High Pass
Source: Select a waveform source to filter.
Down: Set the lower limit of the cutoff frequency.
All the signals from 0Hz to the lower limit of cut-off frequency can be limited. And other signals will
be passed.
Band Pass
Source: Select a waveform source to filter.
Up: Set the upper limit of the cutoff frequency.
Down: Set the lower limit of the cutoff frequency.
All the signals from down to up frequency can be passed. And other signals will be limited.
Band Stop
Up: Set the upper limit of the cutoff frequency.
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Basic Operation
Down: Set the lower limit of the cutoff frequency.
All the signals from down to up frequency can be limited. And other signals will be passed.
Note: The upper limit of the frequency is the sampling rate divided by 2.5.
2.13.11 Wave
Press “Utility->F6->F6” to page 3 of utility menu to select “Wave”.
Options
Settings
Source
CH1
CH2
Select a waveformsource to store.
Flash
Save the source waveform to flash.
USB
Save the source waveform to USB device.
Media
SD
Loacation
Comments
Save the source waveform to SD card.
0~99
Select stored location when save waveform to flash media.
Save
Save the source waveform to the selected reference location.
Recall
Recall saved source waveform to the selected reference location.
Delete
Delete saved waveform.
Page 2/2
Operation
SD to USB
Copy waveform files to USB device.
2.13.12 DDS
Press “Utility->F6->F6” to page 3 and select “Option->DDS” of utility menu to enable to waveform
generator function.
2.13.13 DVM
Press “Utility->F6->F6” to page 3 and select “Option->DVM” of utility menu to calculate the Root
Mean Square voltage over the entire waveform(CRMS).
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Basic Operation
2.14 Help System
This oscilloscope has a Help system with topics covering all of its features. You can use the Help
system to display several kinds of information:

General information about understanding and using the oscilloscope, such as Using the Menu
System.

Information about specific menus and controls, such as the Vertical Position Control.

Advice to problems you may come across while using an oscilloscope, such as Reducing
Noise.
The Help system provides three methods for you to find the information you want:
context-sensitive, hyperlinks, and an index.

Context-Sensitive
Push the HELP front-panel button and the oscilloscope displays information about the last menu
displayed on the screen. The HELP SCROLL LED lights beside the HORIZONTAL POSITION
knob indicate the alternative function of the knob. If a topic uses more than one page, turn the
HELP SCROLL knob to move from page to page within the topic.

Hyperlinks
Most of the help topics contain phrases marked with angle brackets, such as <Autoset>. They are
links to other topics. Turn the HELP SCROLL knob to move the highlight from one link to another.
Push the Show Topic option button to display the topic corresponding to the highlighted link. Press
the Back option button to return to the previous topic.

Index
Push the front-panel HELP button, and then press the Index option button. Push the Page Up or
Page Down option button until you find the index page which contains the topic you want to view.
Turn the HELP SCROLL knob to highlight a help topic. Press the Show Topic option button to
display the topic.
NOTE: Press the Exit option button or any menu button to remove the Help text from the
screen and return to displaying waveforms.
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Basic Operation
2.15 Fast Action Buttons
RUN/STOP: Continuously acquire waveforms or stop the acquisition.
SINGLE SEQ: Acquire a single waveform and then stop the acquisition.
AUTOSET: Automatically set the oscilloscope controls to generate a usable display of the input
signals. Refer to the following table for relative content.
2.15.1 Autoset
Autoset is one of the advantages digital oscilloscopes have. When you push the AUTOSET button,
the oscilloscope will identify the type of waveform (sine or square wave) and adjust controls
according to input signals so that it can accurately display the waveform of the input signal.
Functions
Settings
Acquire Mode
Adjusted to Normal or Peak Detect
Cursor
Off
Display Format
Set to YT
Display Type
Set to Vectors for an FFT spectrum; otherwise, unchanged
Horizontal Position
Adjusted
SEC/DIV
Adjusted
Trigger Coupling
Adjusted to DC, Noise Reject or HF Reject
Trigger Holdoff
Minimum
Trigger Level
Set to 50%
Trigger Mode
Auto
Trigger Source
Adjusted; Autoset can not be used for the EXT TRIG signal
Trigger Slope
Adjusted
Trigger Type
Edge
Trigger Video Sync
Adjusted
Trigger Video Standard
Adjusted
Vertical Bandwidth
Full
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Basic Operation
Vertical Coupling
VOLTS/DIV
DC (if GND was chosen before); AC for the video signal; otherwise,
unchanged
Adjusted
The Autoset function examines all channels for signals and displays corresponding waveforms.
Autoset determines the trigger source according to the following conditions.
 If multiply channels get signals, the oscilloscope will use the channel with the lowest
frequency signal as the trigger source.
 If no signals are found, the oscilloscope will use the lowest-numbered channel displayed
in Autoset as the trigger source.
 If no signals are found and no channels are displayed, the oscilloscope will display and
use Channel 1 as the trigger source.
Sine Wave:
When you use the Autoset function and the oscilloscope determines that the signal is similar to a
sine wave, the oscilloscope displays the following options.
Sine Wave Options
Multi-cycle Sine
Single-cycle Sine
Details
Display multiple cycles that have appropriate vertical and horizontal
scales.
Set the horizontal scale to display about one cycle of the waveform.
Convert the input time-domain signal to its frequency components
FFT
and display the result as a graph of frequency versus amplitude
(spectrum). Since it is a math calculation, see Section 2.7.2 Math FFT
for more information.
Undo Setup
Let the oscilloscope recall the previous setup.
Square Wave or Pulse:
When you use the Autoset function and the oscilloscope determines that the signal is similar to a
square wave or pulse, the oscilloscope displays the following options.
Square Wave Options
Multi-cycle Square
Details
Display multiple cycles that have appropriate vertical and horizontal
scales.
Set the horizontal scale to display about one cycle of the waveform.
Single-cycle Square
The oscilloscope displays Min, Mean and Positive Width automatic
measurements.
Rising Edge
Display the rising edge.
Falling Edge
Display the falling edge.
Undo Setup
Let the oscilloscope recall the previous setup.
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Basic Operation
2.16 Waveform Generator
2.16.1 Set Wave Type and Parameters
QC1936 oscilloscope is equipped with waveform generator function, with one channel of arbitrary
waveform output. User can edit the arbitrary waveform or choose the regular waveforms such as
Sine, Ramp, Square, Trapezia, DC, Exponent, AM/FM.
1. Push the GEN/DSO button to display the DDS Menu.
2. Press F1 or F2 softkey to select the desired waveform.
3. Press F3 softkey to set frequency.
4. Press F4 softkey to set amplitude.
5. Press F5 softkey to set offset.
6. Press F6 softkey to enter the second page.
7. Press F3 softkey to set the waveform parameter.
8. Press F1 or F2 softkey to set the burst type.
There are six types: EXT Low, EXT High, EXT Rise, EXT Fall, Single, and Continuous.
When you select Single burst type, press F4 to burst the waveform.
When you select AM/FM waveform, please set the waveform parameter as follows:
Type: Select "AM" or "FM".
F0: Set the carrier wave frequency.
Depth: Set the wave Depth.
Max Freq: Set the wave Max frequency deviation.
2.16.2 Edit Arbitrary Waveform
User can't edit arbitrary waveform directly under Wave Gen interface for the device. Firstly,
please double click “WaveEditorSetup.exe” in WaveEditor folder in CD disk and install Arbitrary
Waveform Editor software according to installation wizard. After the software installed successfully,
you can see WaveEditor icon on desktop. Double-click the icon to enter arbitrary waveform
generator window.
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Basic Operation
Menu:
Import from CSV: Import the CSV format file to the arbitrary waveform generator window.
Export as CSV: Save as CSV format file.
Import from ARB: Import the ARB format file to the arbitrary waveform generator window.
Export as ARB: Save as ARB format file.
Note: The device can recall ARB and CSV format file in USB disk.
Toolbar buttons
: Download waveform data to the device.
: Smooth Drawing Mode. You can draw any waveform shape using the left-mouse.
: Line Drawing Mode. You can click on the waveform to draw a straight line from the previous
point.
: Zoom tools. To zoom the time axis in or out, click the + or - zoom button and then click
on the waveform area. Click the 100% button to restore the time axis to its original scale.
: Standard waveform shapes. Draw a standard waveform with the settings
specified in the numerical controls below the toolbar. The current waveform will be erased.
: Cycles. The number of cycles to draw. This control is used in conjunction with the
Standard waveform shapes buttons. Select one of the standard waveform shapes and then
enter the number of cycles, and it will draw the requested number of cycles of the waveform.
: Minimum. When one of the Standard waveform shapes buttons is pressed, this
control sets the minimum signal level.
: Maximum. When one of the Standard waveform shapes buttons is pressed,
this control sets the maximum signal level.
: Duty cycle. When a square, triangular or ramp waveform is selected using
one of the Standard waveform shapes buttons, this control sets the duty cycle of the signal.
Duty cycle is defined as the time that the signal spends above zero volts divided by the total cycle
time. Thus, a symmetrical square or triangular wave has a duty cycle of 50%. Reducing the duty
DSO4000 Series Digital Storage Oscilloscope
49
Basic Operation
cycle shortens the positive part of the cycle and lengthens the negative part, and increasing the
duty cycle does the opposite.
Note:
The Frequency, Amplitude, Offset parameter of the ARB waveform can not be regulated in this
WaveEditor software, but it can be done by tuning on the device directly (refer to above Chapter
2.16.1) after the waveform data is downloaded to device (refer to below Chapter 2.16.3).
Do not use the WaveEditor and the DSO software at the same time, it will cause errors.
2.16.3 Output Arbitrary Waveform
1. Press the GEN/DSO button on the front panel to enter DDS function menu.
2. Press GEN ON/GEN OFF button on the front panel to enable the output function.
3. Connect the device with PC which has installed the WaveEditor software using a USB cable.
4. Double click the WaveEditor icon to open the program.
5. Select a waveform file or draw an arbitrary waveform; then click the
in toolbar and select
waveform data download position to download waveform data to the device.
The waveform will output from GEN OUT BNC port.
Also, you can recall ARB format file in USB disk to output a waveform.
1. Press the GEN/DSO button on the front panel to enter DDS function menu.
2. Press GEN ON/GEN OFF button on the front panel to enable the output function.
3. Press F1 or F2 softkey to select Arb1~Arb4.
4. Press F6 softkey twice to enter recall menu, and select desired recalled ARB and CSV format
file in USB disk.
5. The waveform will output from GEN OUT BNC port.
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Basic Operation
2.17 Power Amplifier(Optional)
If users set the Power Amplifier Out to turn on, the power amplifier board will work in the
instrument. When using the power amplifier, use a connecting cable to input the signal to the input
terminal “GEN OUT”, there will be a 2-time-amplified signal in the output terminal “2 time power
amplifier output”. The input signal should be the GEN OUT signal, not external signal.
Frequency Range
The frequency range of power amplifier is 10Hz~150kHz. Amplitude flatness within this frequency
range is better than 3%, and sine distortion is better than 1%. The maximum testing frequency is
up to 200kHz.
Output Power
The equation for output power of power amplifier is:
P=V2/R
P is the output power, with the unit of W
V is the output amplitude RMS value, with the unit of Vrms
R is the load resistance, with the unit of Ω
The maximum output amplitude is up to 22Vpp (7.8Vrms). The minimum load resistance is 2Ω. As
the ambient temperature increases, the output signal frequency increases too. The lower output
signal distortion is required, the smaller the max.output power is. Generally, the maximum output
power can be up to 7W (8Ω) or 1W (50Ω).
Output Protection
The power amplifier has short circuit protection and over heat protection. It may not be burnt out in
common operation. However, to prevent damage to power amplifier’s performance, long time
short circuit output should be avoided. Please also avoid to frequently using the maximum value of
the frequency, amplitude and load.
Power Amp Out
Power Out: Turn on or turn off power amplifier out.
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Chapter 3 Application Examples
This chapter unfolds a further description on main features of the oscilloscope by giving eleven
simplified application examples for reference to help solve your own test problems.
1.
Taking simple measurements
Using AUTOSET
Using the Measure menu to take auto measurements
2.
Taking cursor measurements
Measuring ring frequency and ring amplitude
Measuring pulse width
Measuring rise time
3.
Analyzing input signals to eliminate random noise
Observing a noisy signal
Eliminating random noise
4.
Capturing a single-shot signal
5.
Using X-Y mode
6.
Triggering on a pulse width
7.
Triggering on a video signal
Observing triggers on video fields and video lines
8.
Using Slope Trigger to capture a particular slope signal
9.
Using Overtime Trigger to measure a long pulse signal
10. Using math functions to analyze waveforms
11. Measuring data propagation delay
3.1 Example 1: Taking Simple Measurements
When you want to observe an unknown signal in a certain circuit without having its amplitude and
frequency parameters, you may use this function to take a fast measurement on the frequency,
period and peak-to-peak amplitude of the signal.
Follow the steps below.
1. Set the switch on the oscilloscope probe to 10X;
2. Push the CH1 MENU button and set the Probe option attenuation to 10X;
3. Connect the CH1 probe to the test point of the circuit;
4. Press the AUTOSET button.
The oscilloscope will automatically set the waveform to a best display. If you want to further
optimize the waveform display, you may manually adjust the vertical and horizontal controls until
the waveform meets your particular requirement.
Taking Auto Measurements
The oscilloscope can display most signals by automatic measurements. To measure such
parameters as the signal frequency, period, peak-to-peak amplitude, rise time and positive width,
follow the steps below.
1. Push the MEASURE button to see the Measure menu.
2. Turn the knob V0 to select the first ‘unspecified’ option (marked by red arrow), press V0 or F6
to enter the submenu.
3. Select CH1 for the Source option. Then repeatedly push F3 or F4 to select measure items in
the Type menu. Push the back menu to go back to the measure interface. Or turn and push
V0 to select a measure item and go back to the measure interface. The corresponding box
under the measure item shows the measurements.
4. Repeat Step 2 and Step 3. Then select other measure items. Totally 8 measure items can be
displayed.
Note: All readouts change with the measured signals.
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The figure below shows three measure items as an example. The boxes under them display the
measurements in large fonts.
3.2 Example 2: Taking Cursor Measurements
You can use the cursor to quickly measure the time and amplitude of a waveform.
Measuring Ring Time (convertible to Frequency) and Amplitude on Rising Edge of Pulse
To measure the ring time on the rising edge of the pulse, follow the steps below.
1.
Push the CURSOR button to view the Cursor menu.
2.
Push F1 the Type option button and select Time.
3.
Push F2 or F3 the Source option button and select CH1.
4.
Push F4 to select a cursor. If S is selected, turn V0 to move Cursor S on the screen; if E is
selected, turn V0 to move Cursor E; if both are selected, turn V0 to move them at the same
time.
5.
Put Cursor S on the first peak of the ring.
6.
Put Cursor E on the second peak of the ring.
7.
At Delta displays the measured time and at Cursor S an Cursor E display the positions of
these two cursors.
8.
Push the Type option button and select Voltage.
9.
Put Cursor S on the highest peak of the ring.
10. Put Cursor E on the lowest point of the ring. The amplitude of the ring will be displayed at
Delta.
See figures below for better understanding.
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Measuring Pulse Width
To analyze a pulse signal and to know its width, follow the steps below.
1.
Push the CURSOR button to view the Cursor menu.
2.
Push F1 the Type option button and select Time.
3.
Push F2 or F3 the Source option button and select CH1.
4.
Push F4 to select a cursor. If S is selected, turn V0 to move Cursor S on the screen; if E is
selected, turn V0 to move Cursor E; if both are selected, turn V0 to move them at the same
time.
5.
Place Cursor S on the rising edge of the pulse and Cursor E on the falling edge.
6.
Thus at Delta displays the measured time and at Cursor S and Cursor E displays the time
relative to the trigger.
See the figure below for better understanding.
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Measuring Rise Time of Pulse
You may need to measure the rise time of the pulse in many application environments, usually, to
measure the rise time between the 10% and 90% levels of the pulse waveform. To do so, follow
the steps below.
1.
Turn the SEC/DIV knob to display the rising edge of the waveform.
2.
Turn the VOLTS/DIV and VERTICAL POSITION knobs to adjust the waveform amplitude to
about 5 divisions.
3.
Push the CH1 MENU button.
4.
Push the VOLTS/DIV option button and select Fine. Turn the VERTICAL POSITION knob to
accurately separate the waveform into 5 divisions.
5.
Turn the VERTICAL POSITION knob to center the waveform. Position the waveform baseline
to 2.5 divisions below the center graticule.
6.
Press the CURSOR button.
7.
Push the Type option button and select Time. Push the Source option button to select CH1.
8.
Select Cursor S and turn V0 to place it at the 10% level of the waveform.
9.
Select Cursor E and turn V0 to place it at the 90% level of the waveform.
10. The Delta readout in the Cursor Menu is the rise time of the pulse.
See the figure below for better understanding.
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5 divisions
3.3 Example 3: Analyzing Input Signals to Eliminate
Random Noise
In certain circumstances, to display a noisy signal on the oscilloscope and to get its details, you
may follow the steps below to analyze this signal.
Observing Noisy Signal
1.
Press the ACQUIRE button to see the Acquire menu.
2.
Push the Type option button and select Real Time.
3.
Push the Peak Detect option button.
4.
If necessary, push the DISPLAY button and set the Contrast option to view the noise more
clearly.
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57
See the figure below for better understanding.
Eliminating Random Noise
1.
Press the ACQUIRE button to see the Acquire menu.
2.
Push the Type option button and select Real Time.
3.
Push the Average option button.
4.
Push the Averages option button and adjust the number of running averages to watch the
change in the waveform display.
Note: Averaging reduces random noise and let you view the signal details more easily.
See the figure below for better understanding
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3.4 Example 4: Capturing Single-shot Signal
You may refer to the following example to easily capture some aperiodic signals like pulses and
glitches.
To set for a single-shot acquisition, follow the steps below.
1.
First, set up the oscilloscope probe and the attenuation factor of CH1.
2.
Turn the vertical VOLTS/DIV and horizontal SEC/DIV knobs to a proper position for a better
examination of the signal.
3.
Press the ACQUIRE button to see the Acquire menu.
4.
Push the Peak Detect option button.
5.
Push the TRIG MENU button and select Rising for the Slope option. Then adjust the trigger
level properly.
6.
Push the SINGLE SEQ button to start the acquisition.
Using this feature can help you to capture occasional events more easily. This is an advantage of
the digital storage oscilloscope.
3.5 Example 5: Using X-Y Mode
Viewing Phase Differences between Two Channel Signals
For example, you need to measure the change in a phase across a circuit network.
Connect the oscilloscope with circuitry and view the input and output of the circuit in XY mode.
Follow the steps below.
1.
First, prepare two oscilloscope probes and set the switches to 10X on both probes.
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59
2.
Push the CH1 MENU button and set the Probe option attenuation to 10X; push the CH2
MENU button and set the Probe option attenuation to 10X.
3.
Connect the CH1 probe to the input of the network, and connect the CH2 probe to the output.
4.
Push the AUTOSET button.
5.
Turn the VOLTS/DIV knobs to display approximately the same amplitude signals on each
channel.
6.
Push the DISPLAY button to see the Display menu.
7.
Push the Format option button and select XY.
8.
Now the oscilloscope displays a Lissajous pattern to characterize the input and output of the
circuit.
9.
Turn the VOLTS/DIV and VERTICAL POSITION knobs to properly scale the waveform
display.
10. Use the Lissajous's oscillographic method to observe and calculate the phase differences
following the formula below.
As sinθ=A/B or C/D, in which θ is the phase difference angle between channels and A, B, C, D
represent what shown in the figure below, you can get the value of the phase difference angle by
the formula: θ=±arcsin(A/B) or ±arcsin(C/D).
If the principal axes of the ellipse are in the first and third quadrants, the phase difference angle
should be in the first and fourth quadrants, i.e. within (0~π/2) or (3π/2~2π). If the principal axes of
the ellipse are in the second and fourth quadrants, the phase difference angle should be in the
second and third quadrants, i.e. within (π/2~π) or (π-3π/2). See the figure below for better
understanding.
Signal Horizontal
Centering
A
D
B
C
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3.6 Example 6: Triggering on Pulse Width
Triggering on a Specific Pulse Width
While testing the pulse width of a signal in a circuit, you may need to verify the pulse width is
consistent with the theoretic value. Or even if the edge triggering shows that your signal has the
same pulse width with the specific signal, you still doubt about the result. Then you can follow the
steps below.
1.
Set the Probe option attenuation to 10X.
2.
Push the AUTOSET button to trigger a stable waveform display.
3.
Push the Single Cycle option button in the Autoset menu and read out the signal pulse width.
4.
Push the TRIG MENU button.
5.
Push F1 to select Pulse for the Type option; push F2 to select CH1 for the Source option; turn
the TRIGGER LEVEL knob to set the trigger level at the bottom of the signal.
6.
Push F6 to enter the next page. Select the When option button and Push F4 to select ‘=’.
7.
Push the Set Pulse Width option button. Turn V0 to set the pulse width to the value read out in
Step 3.
8.
Turn the TRIGGER LEVEL knob to set the pulse width to the value read out in Step 3.
9.
Push the More option button and select Normal for the Mode option. Once triggering on
normal pulses, the oscilloscope can give a stable waveform display.
10. If the When option is set to >, < or ≠ and there appear any aberrant pulses that meet the
specified condition, the oscilloscope will trigger. For example, the signal contains such
aberrant pulses as shown below, you may select ‘≠’ or ‘<’ to trigger on the pulse.
As shown in the above figure, you can get a stable waveform display if inputting a square wave at
the frequency of 1KHz, with pulse width set to 500μs.
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3.7 Example 7: Triggering on Video Signal
Assume that you are monitoring the video signals of a television to see if they are input normally,
and the video signal is of an NTSC system. You can get a stable display by using the video trigger.
Triggering on Video Fields
To trigger on the video fields, follow the steps below.
1.
Push the TRIG MENU button to see the Trigger menu.
2.
Push F1 to select Video for the Type option.
3.
Push the Source option button to select CH1; push the Polarity option button to select Normal;
push the Standard option button to select NTSC.
4.
Push the Sync option button to select Odd Field, Even Field or All Fields.
5.
Turn the Trigger Level knob to adjust the trigger level and stabilize video signals.
6.
Turn the horizontal SEC/DIV and the Vertical Position knobs to display on the screen a
complete video signal triggering on a video field.
The figure below shows a stable signal triggering on a video field.
Triggering on Video Lines
To trigger on the video lines, follow the steps below.
1.
Push the TRIG MENU button to see the Trigger menu.
2.
Push F1 to select Video for the Type option.
3.
Push the Source option button to select CH1; push the Polarity option button to select Normal;
push the Standard option button to select NTSC; push the Sync option button to select Line
Number.
4.
Turn the Trigger Level knob to adjust the trigger level and stabilize video signals.
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5.
Turn V0 to adjust the line number (NTSC: 0-525 lines).
6.
Turn the horizontal SEC/DIV and the vertical VOLTS/DIV knobs to display on the screen a
complete video signal triggering on a video line. See the figure below.
3.8 Example 8: Using Slope Trigger to Capture Particular
Slope Signal
In many occasions, we are not only concerned about the edge of the signal, but also want to know
the rise and fall times of the signal. To better observe this kind of signals, we bring in the slope
trigger. Follow the steps below.
1.
Push the TRIG MENU button to see the Trigger menu.
2.
Push F1 to select Slope for the Type option.
3.
Push the Source option button to select CH1; push the Slope option button to select Rising;
push the Mode option button to select Auto; push the Coupling option button to select DC.
4.
Click the ‘Next Page’ button and select Vertical. Turn the V0 knob to adjust V1 and V2 to
proper locations. Select the When option button and set it to ‘=’.
5.
Select ‘Time’ and turn V0 to adjust the time until you get a stable display of waveforms. See
the figure below.
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3.9 Example 9: Using Overtime Trigger to Measure Long
Pulse Signal
It is not easy to observe some part of a long pulse signal by using the edge or pulse width trigger.
In such case, you can use the overtime trigger by following steps.
1.
Push the TRIG MENU button to see the Trigger menu.
2.
Push F1 to select OT for the Type option; push the Polarity option button to select Normal;
push the Mode option button to select Auto; push the Coupling option button to select DC.
3.
Turn the Trigger Level knob to adjust the trigger level and stabilize video signals.
4.
Turn V0 to adjust the line number (NTSC: 0-525 lines).
5.
Turn the horizontal SEC/DIV and the vertical VOLTS/DIV knobs to display on the screen a
complete video signal triggering on a video line. See the figure below.
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Note: The difference between the overtime and the delay triggers is that the overtime
trigger can identify the pulse you need according to your set time and trigger on any point
of the pulse. In the other word, the overtime trigger occurs based on pulse identification. It
is similar to the > mode of the pulse width trigger, but not the same.
3.10 Example 10: Using Math Functions to Analyze
Waveforms
Using math functions to analyze input waveforms is another advantage of the digital oscilloscope.
For example, you want to get the instantaneous difference between two channel waveforms. By
using the math function of the oscilloscope, you can get a better representation of the waveform
on the screen. To observe this signal, follow the steps below.
1.
Set the Probe option attenuation to 10X.
2.
Open CH1 and CH2 at the same time, both with the attenuation of 10X.
3.
Push the AUTOSET button to trigger a stable waveform.
4.
Push the MATH MENU button to see the Math menu.
5.
Push the Operation option button and select ‘CH1+CH2’.
6.
Turn the horizontal SEC/DIV and the vertical VOLTS/DIV knobs to properly scale the
waveform for easy check.
In addition, the oscilloscope also supports the - and FFT functions. For a detailed analysis on FFT,
refer to Chapter 2.7.2 Math FFT.
Note: You should compensate both probes before performing the math operation;
otherwise, differences in probe compensation will appear as errors in the differential
signal.
As illustrated in the above figure, input a 1KHz sine wave from CH1 and a 1KHz square wave from
DSO4000 Series Digital Storage Oscilloscope
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CH2.
Follow the above steps to set up the Math menu, and observe the subtracted waveform as shown
in the figure below.
Those in pink are added waveforms.
3.11 Example 11: Measuring Data Propagation Delay
When you doubt that there appear instabilities in a serial data propagation control circuit, you can
set the oscilloscope to measure the propagation delay between the enable signal and the transfer
data.
To set the propagation delay measurement, follow the steps below.
1.
Connect two oscilloscope probes respectively to the CS (chip-select) pin and the DATA pin on
the chip.
2.
Set the Probe option attenuation to 10X for both probes.
3.
Open CH1 and CH2 at the same time, both with the attenuation of 10X.
4.
Push the AUTOSET button to trigger a stable waveform display.
5.
Adjust the horizontal and vertical controls to optimize the waveform display.
6.
Push the CURSOR button to view the Cursor menu.
7.
Push the Type option button and select Time.
8.
Select Cursor S and turn V0 to place it on the active edge of the enable signal.
9.
Select Cursor E and turn V0 to place it on the data output transition (See the figure below).
10. Read the data propagation delay in the Delta readout.
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CH1
DATA
CH2
CS
CS
DATA
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Chapter 4 Troubleshooting
4.1 Problem Settlement
1. If the oscilloscope does not start up at power on, follow these steps:
1） Check the power cord to verify it has been connected properly;
2） Check the power on/off button to ensure it has been pushed;
3） Then restart the oscilloscope.
2. If there is no display of waveforms on the screen when the oscilloscope is turned on,
follow these steps:
1） Check the probe to assure its proper connection to the input BNC;
2） Check the channel switch (such as CH1, CH2 menu buttons) to make sure it has been turned
on;
3） Check the input signal to verify it has been connected to the probe correctly;
4） Affirm that all measured circuits have signals to output;
5） Turn up the magnitude for DC signals with large magnitude;
6） In addition, you may press the Auto Measure button to perform an automatic detection of
signals at first.
3. If the waveform of the input signal is distorted seriously, follow these steps:
1） Check the probe to assure its proper connection to the channel BNC;
2） Check the probe to assure its good connection to the measured object;
3） Check the probe to verify it has been well calibrated. Otherwise, refer to the content about
calibration described in this manual.
4. If the waveform is rolling continuously on the screen but can not be triggered, follow
these steps:
1） Check the trigger source to make sure it consistent with the input channel;
2） Check the trigger level to assure its correct adjustment. You may push the TRIGGER LEVEL
knob or press the SET TO 50% button to reset the trigger level back to the center of the signal;
3） Check the trigger mode to confirm it is a right choice for the input signal. The default trigger
mode is edge trigger. However, it is not suitable for all kinds of input signals.
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68
Specifications
Chapter 5 Specifications
5.1 Technical Specifications
All specifications herein mentioned apply to the DSO4000 series oscilloscopes. Before checking
an oscilloscope from your seller to see if it complies with these specifications, make sure it meets
the following conditions:



The oscilloscope must have been operating continuously for twenty minutes under the
specified operating temperature.
The Do Self Cal operation must be performed through the Utility menu if the operating
temperature changes by more than 5℃.
The oscilloscope must be within the factory calibration interval.
All specifications are guaranteed unless noted ‘typical’.
Oscilloscope Specifications
Horizontal
Sample Rate Range
1GS/s
Waveform Interpolation
(sin x)/x
Record Length
Maximum 40K samples per single-channel; maximum 20K
samples per dual-channel (4K, 20K optional)
SEC/DIV Range
2ns/div to 40s/div, in a 2, 4, 8 sequence
Sample Rate and
Delay Time Accuracy
±50ppm over any ≥1ms time interval
Delta Time Measurement
Accuracy
(Full Bandwidth)
Single-shot, Normal mode
± (1 sample interval +100ppm × reading + 0.6ns)
>16 averages
± (1 sample interval + 100ppm × reading + 0.4ns)
Sample interval = s/div ÷ 200
Position Range
2ns/div to 8ns/div
(-8div × s/div) to 20ms
20ns/div to 80μs/div
(-8div × s/div) to 40ms
200μs/div to 40s/div
(-8div × s/div) to 400s
Vertical
A/D Converter
8-bit resolution,
each channel sampled simultaneously
VOLTS/DIV Range
2mV/div to 10V/div at input BNC
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Specifications
Offset Range
2mV/div to 20mV/div, ±400mV
50mV/div to 200mV/div, ±2V
500mV/div to 2V/div, ±40V
5V/div to 10V/div, ±50V
Selectable Analog Bandwidth Limit,
typical
20MHz
Low Frequency Response (-3db)
≤10Hz at BNC
Rise Time at BNC, typical
DSO4072
DSO4102
DSO4202
≤5.0ns
＜3.5ns
<1.8ns
±3% for Normal or Average acquisition mode, 10V/div
to 10mV/div
±4% for Normal or Average acquisition mode, 5mV/div
to 2mV/div
DC Gain Accuracy
Measurement Type: Average of ≥16 waveforms with
vertical position at zero
Accuracy: ± (3% × reading + 0.1div + 1mV) when
10mV/div or greater is selected
DC Measurement Accuracy,
Average Acquisition Mode
Volts Measurement Repeatability,
Average Acquisition Mode
Measurement Type: Average of ≥16 waveforms with
vertical position not at zero
Accuracy: ± [3% × (reading + vertical position) + 1% of
vertical position + 0.2div]
Add 2mV for settings from 2mV/div to 200mV/div; add
50mV for settings from 200mV/div to 10V/div
Delta volts between any two averages of ≥16
waveforms acquired under same setup and ambient
conditions
Note: Bandwidth reduced to 6MHz when using a 1X probe.
Trigger
Coupling
Trigger Sensitivity
(Edge Trigger Type)
DC
Sensitivity
Source
DSO4072, DSO4102
DSO4202
CH1
CH2
1div from DC to
10MHz;
1.5div from 10MHz to
Full
1.5div from 10MHz
to 100MHz;
2div from 100MHz
to Full
200mV from DC to
100MHz
200mV from DC to
100MHz; 350mV
from 100MHz to
200MHz
1V from DC to
100MHz
1V from DC to
100MHz;
1.75V from 100MHz
to 200MHz
EXT
EXT/5
AC
Attenuates signals below 10Hz
HF Reject
Attenuates signals above 80kHz
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Specifications
Trigger Level Range
Trigger Level
Accuracy, typical
(Accuracy is for
signals having rise
and fall times ≥20ns)
Set Level to 50%,
typical
LF Reject
Same as the DC-coupled limits for frequencies above
150kHz; attenuates signals below 150kHz
Source
Range
CH1, CH2
±8 divisions from center of screen
EXT
±1.2V
EXT/5
±6V
Source
Accuracy
CH1、CH2
0.2div × volts/div within ±4 divisions from center of
screen
EXT
± (6% of setting + 40mV)
EXT/5
± (6% of setting + 200mV)
Operates with input signals ≥50Hz
Note: Bandwidth reduced to 6MHz when using a 1X probe.
Video Trigger Type
Source
Range
CH1, CH2
Peak-to-peak amplitude of 2 divisions
EXT
400mV
EXT/5
2V
Signal Formats and
Field Rates, Video
Trigger Type
Supports NTSC, PAL and SECAM broadcast systems for any field or
any line
Holdoff Range
100ns to 10s
Pulse Width Trigger
Pulse Width Trigger
Mode
Trigger when < (Less than), > (Greater than), = (Equal), or ≠ (Not Equal);
Positive pulse or Negative pulse
Pulse Width Trigger
Point
Equal: The oscilloscope triggers when the trailing edge of the pulse
crosses the trigger level.
Not Equal: If the pulse is narrower than the specified width, the trigger
point is the trailing edge. Otherwise, the oscilloscope triggers when a
pulse continues longer than the time specified as the Pulse Width.
Less than: The trigger point is the trailing edge.
Greater than (also called overtime trigger): The oscilloscope triggers
when a pulse continues longer than the time specified as the Pulse
Width.
Pulse Width Range
Selectable from 20ns to 10s
Slope Trigger
Slope Trigger Mode
Trigger when < (Less than), > (Greater than), = (Equal), or ≠ (Not Equal);
Positive slope or Negative slope
Slope Trigger Point
Equal: The oscilloscope triggers when the waveform slope is equal to
the set slope.
Not Equal: The oscilloscope triggers when the waveform slope is not
equal to the set slope.
DSO4000 Series Digital Storage Oscilloscope
71
Specifications
Less than: The oscilloscope triggers when the waveform slope is less
than the set slope.
Greater than: The oscilloscope triggers when the waveform slope is
greater than the set slope.
Time Range
Selectable from 20ns to 10s
Overtime Trigger
The leading edge: Rising edge or Falling edge; Time Setting: 20-10s
Swap Trigger
CH1
Internal Trigger: Edge, Pulse Width, Video, Slope
CH2
Internal Trigger: Edge, Pulse Width, Video, Slope
Trigger Frequency
Counter
Readout Resolution
6 digits
Accuracy (typical)
±30ppm (including all frequency reference errors and ±1 count errors)
Frequency Range
AC coupled, from 4Hz minimum to rated bandwidth
Signal Source
Pulse Width or Edge Trigger modes: all available trigger sources
The Frequency Counter measures trigger source at all times, including
when the oscilloscope acquisition pauses due to changes in the run
status, or acquisition of a single shot event has completed.
Pulse Width Trigger mode: The oscilloscope counts pulses of significant
magnitude inside the 1s measurement window that qualify as triggerable
events, such as narrow pulses in a PWM pulse train if set to < mode and
the width is set to a relatively small time.
Edge Trigger mode: The oscilloscope counts all edges of sufficient
magnitude and correct polarity.
Video Trigger mode: The Frequency Counter does not work.
Acquisition
Acquisition Modes
Normal, Peak Detect, and Average
Acquisition Rate,
typical
Up to 2000 waveforms per second per channel (Normal acquisition
mode, no measurement)
Single Sequence
Acquisition Mode
Acquisition Stop Time
Normal,
Peak Detect
Upon single acquisition on all channels
simultaneously
Average
After N acquisitions on all channels simultaneously,
N can be set to 4, 8, 16, 32, 64 or 128
Inputs
Inputs
Input Coupling
DC, AC or GND
Input Impedance,
DC coupled
1MΩ±2% in parallel with 20pF±3pF
Probe Attenuation
1X, 10X
DSO4000 Series Digital Storage Oscilloscope
72
Specifications
Supported Probe
Attenuation Factors
Maximum Input
Voltage
1X, 10X, 100X, 1000X
Overvoltage Category
Maximum Voltage
CAT I and CAT II
300VRMS (10×), Installation Category
CAT III
150VRMS (1×)
Installation Category II: derate at 20dB/decade above 100kHz to 13V
peak AC at 3MHz* and above. For non-sinusoidal waveforms, peak
value must be less than 450V. Excursion above 300V should be of less
than 100ms duration. RMS signal level including all DC components
removed through AC coupling must be limited to 300V. If these values
are exceeded, damage to the oscilloscope may occur.
Measurements
Cursors
Voltage difference between cursors: △V
Time difference between cursors: △T
Reciprocal of △T in Hertz (1/ΔT)
Automatic
Measurements
Frequency, Period, Mean, Peak-to-peak, Cycle RMS, PRMS, Minimum,
Maximum, Rise Time, Fall Time, + Width, - Width, + Duty, - Duty, Base,
Top, Middle, Amplitude, Overshoot, Preshoot, Pmean, FOVShoot,
RPREShoot, BWidth, Delay 1-2 ↑, Delay 1-2 ↓, LFF, LFR, LRF, LRR,
FFR, EFRF
General Specifications
Display
Display Type
7 inch 64K color TFT (diagonal liquid crystal)
Display Resolution
800 horizontal by 480 vertical pixels
Display Contrast
Adjustable (16 gears) with the progress bar
Probe Compensator Output
Output Voltage,
typical
About 5Vpp into ≥1MΩ load
Frequency, typical
1kHz
Power Supply
Supply Voltage
100-120VACRMS(±10%), 45Hz to 440Hz, CATⅡ
120-240VACRMS(±10%), 45Hz to 66Hz, CATⅡ
Power Consumption
<30W
Fuse
2A, T rating, 250V
Environmental
Temperature
Cooling Method
Humidity
Operating: 32℉ to 122℉ (0℃ to 50℃)
Nonoperating: -40℉ to 159.8℉ (-40℃ to +71℃)
Convection
+104℉ or below (+40℃ or below): ≤90% relative humidity
106℉ to 122℉ (+41℃ to 50℃): ≤60% relative humidity
DSO4000 Series Digital Storage Oscilloscope
73
Specifications
Altitude
Mechanical Shock
Operating and Nonoperating
3,000m (10,000 feet)
Random Vibration
0.31gRMS from 50Hz to 500Hz, 10
minutes on each axis
Nonoperating
2.46gRMS from 5Hz to 500Hz, 10
minutes on each axis
Operating
50g, 11ms, half sine
Length
313mm
Height
142mm
Depth
108mm
exclusive of packing and
accessories
2.08Kg
Mechanical
Size
Weight
Arbitrary Waveform Generator Mode
Waveform Frequency
Sine wave: 1Hz~25MHz (-3dB)
Square wave: 1Hz~5MHz
Ramp wave 1Hz~10MHz
Trapezium wave 1Hz~5MHz
AM/FM wave 1Hz~5MHz
Arbitrary wave: 1Hz~25MHz.
Exponent wave: 1Hz~900KHz
DAC
2K~200MHz adjustable
Frequency Resolution
0.10%
Channel
1CH waveform output
Waveform Depth
2KSa
Vertical Resolution
12 bit
Frequency Stability
<30ppm
Wave Amplitude
±3.5V Max.
Output Impedance
50 Ω
Output Current
50mA, Ipeak=50mA
System BW
25M
Harmonic Distortion
-50dBc(1KHz), -40dBc(10KHz)
Power Amplifier(Optional)
Maximum power output
7W(8 Ω), 1W(50 Ω)
Maximum output voltage
22Vpp
Frequency bandwidth
1Hz~200KHz
DSO4000 Series Digital Storage Oscilloscope
74
Specifications
5.2 Accessories
All the following accessories are available.
Standard Accessories
Sketch
Description
X1, X10 two passive probes. The passive probes have a 6MHz bandwidth
(rated 100Vrms CAT III) when the switch is in the X1 position, and a
maximum bandwidth (rated 300Vrms CAT II) when the switch is in the X10
position. Each probe consists of all necessary fittings.
A USB A-B line, used to connect external devices with USB-B interface
like a printer or to establish communications between PC and the
oscilloscope.
A power cord special for this product. In addition to the power cord shipped
with your instrument, you may purchase another one certified for the
country of use.
A software installation CD. It contains the user manual of DSO4000, giving
particular descriptions on the DSO4000 series oscilloscopes.
*. To this digital storage oscilloscope, the PC software is not important, no
more advanced functions are developed. For example, 1. For the function
of "export into Excel format", there is aleady "Save into CSV" function on
the oscilloscope 2. Export is only possible with BMP format,etc.
5.3 Open Source Information
General Information:
Kernel Version
Linux3.2.35
Supported File system
Yaffs, Fat32
Drivers
Buzzer Driver, DMA Driver, FPGA Driver, I2C Driver,SPI Driver,
IO-bank Driver, USB Host Driver, LCD Driver, USB
massstorage、gadget Driver
Linux Applications
busybox1.18.4, gnupg1.4.11
U_boot Version
Vivi_3.2.35
License: GPLV2
See Appendix B
DSO4000 Series Digital Storage Oscilloscope
75
Chapter 6 General Care and Cleaning
6.1 General Care
Do not put or leave the device in a place where the LCD display will be exposed to direct sunlight
for long periods of time.
Note: To avoid damage to the oscilloscope or probes, do not expose them to sprays, liquids, or
solvents.
6.2 Cleaning
Examine the oscilloscope and probes as often as operating conditions require. To clean the
exterior surface, perform the following steps:
1） Use a lint-free cloth to remove floating dust on the outside of the oscilloscope and probes.
Take care to avoid scratching the glabrous display filter.
2） Use a soft cloth dampened with water to clean the oscilloscope. For more efficient cleaning,
you may use an aqueous solution of 75% isopropyl alcohol.
Note: To avoid damage to the surface of the oscilloscope or probes, do not use any
corrosive or chemical cleaning agents.
DSO4000 Series Digital Storage Oscilloscope
76
Appendix A Harmful and Poisonous
Substances or Elements
Harmful and poisonous substances or elements 1
Component2
Pb
Hg
Cd
Cr(Vi)
PBB
PBDE
Shell and Chassis
X
0
0
X
0
0
Display Module
X
X
0
0
0
0
Circuit Board
X
0
0
X
0
0
Power Supply
X
0
0
X
0
0
Electric Wire and Cable Assembly
X
0
0
0
0
0
Connector
X
0
0
X
0
0
Fastener and Installed Hardware
X
0
X
X
0
0
Other Accessories (including
probes)
X
0
0
X
0
0
Others
0
0
0
0
0
0
‘X’ means that at least the content of this poisonous and harmful substance in a homogeneous
material of this component exceeds the limit specified in the SJ/T 11363-2006 standard.
‘0’ indicates that the content of this poisonous and harmful substance in all homogeneous
materials of this component is refrained under the limit stated in the SJ/T 11363-2006 standard.
This component list contains components approved in the file ‘Management Measures’.
DSO4000 Series Digital Storage Oscilloscope
77
Appendix B
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies of this license document, but
changing it is not allowed.
Preamble
The licenses for most software are designed to take away your freedom to share and change it.
By contrast, the GNU General Public License is intended to guarantee your freedom to share and
change free software--to make sure the software is free for all its users. This General Public
License applies to most of the Free Software Foundation's software and to any other program
whose authors commit tousing it. (Some other Free Software Foundation software is covered by
the GNU Lesser General Public License instead.) You can apply it to your programs, too.
When we speak of free software, we are referring to freedom, notprice. Our General Public
Licenses are designed to make sure that you have the freedom to distribute copies of free
software (and charge for this service if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new free programs; and that you
know you can do these things.
To protect your rights, we need to make restrictions that forbid anyone to deny you these rights
or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you
if you distribute copies of the software, or if you modify it.
For example, if you distribute copies of such a program, whether gratis or for a fee, you must
give the recipients all the rights that you have. You must make sure that they, too, receive or can
get the source code. And you must show them these terms so they know their rights.
We protect your rights with two steps: (1) copyright the software, and (2) offer you this license
which gives you legal permission to copy, distribute and/or modify the software.
Also, for each author's protection and ours, we want to make certain that everyone understands
that there is no warranty for this free software. If the software is modified by someone else and
DSO4000 Series Digital Storage Oscilloscope
78
passed on, we want its recipients to know that what they have is not the original, so that any
problems introduced by others will not reflect on the original authors' reputations.
Finally, any free program is threatened constantly by software patents. We wish to avoid the
danger that redistributors of a free program will individually obtain patent licenses, in effect making
the program proprietary. To prevent this, we have made it clear that any patent must be licensed
for everyone's free use or not licensed at all.
The precise terms and conditions for copying, distribution and modification follow.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains a notice placed by the
copyright holder saying it may be distributed under the terms of this General Public License. The
"Program", below, refers to any such program or work, and a "work based on the Program" means
either the Program or any derivative work under copyright law: that is to say, a work containing the
Program or a portion of it, either verbatim or with modifications and/or translated into another
language. (Hereinafter, translation is included without limitation in the term "modification".)
Each licensee is addressed as "you".
Activities other than copying, distribution and modification are not covered by this License; they
are outside its scope. The act of
running the Program is not restricted, and the output from the Program is covered only if its
contents constitute a work based on the Program (independent of having been made by running
the Program). Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's source code as you receive it,
in any medium, provided that you conspicuously and appropriately publish on each copy an
appropriate copyright notice and disclaimer of warranty; keep intact all the notices that refer to this
License and to the absence of any warranty; and give any other recipients of the Program a copy
of this License along with the Program.
You may charge a fee for the physical act of transferring a copy, and you may at your option offer
warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Program or any portion of it, thus forming a work
based on the Program, and copy and distribute such modifications or work under the terms of
Section 1 above, provided that you also meet all of these conditions:
a) You must cause the modified files to carry prominent notices stating that you changed the
files and the date of any change.
DSO4000 Series Digital Storage Oscilloscope
79
b) You must cause any work that you distribute or publish, that in whole or in part contains or
is derived from the Program or any part thereof, to be licensed as a whole at no charge to all third
parties under the terms of this License.
c) If the modified program normally reads commands interactively when run, you must cause
it, when started running for such interactive use in the most ordinary way, to print or display an
announcement including an appropriate copyright notice and a notice that there is no warranty (or
else, saying that you provide a warranty) and that users may redistribute the program under
these conditions, and telling the user how to view a copy of this License. (Exception: if the
Program itself is interactive but does not normally print such an announcement, your work based
on the Program is not required to print an announcement.)
These requirements apply to the modified work as a whole. If identifiable sections of that work
are not derived from the Program, and can be reasonably considered independent and separate
works in themselves, then this License, and its terms, do not apply to those sections when you
distribute them as separate works. But when you distribute the same sections as part of a whole
which is a work based on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the entire whole, and thus to each
and every part regardless of who wrote it.
Thus, it is not the intent of this section to claim rights or contest your rights to work written entirely
by you; rather, the intent is to exercise the right to control the distribution of derivative or collective
works based on the Program.
In addition, mere aggregation of another work not based on the Program with the Program (or with
a work based on the Program) on a volume of a storage or distribution medium does not bring the
other work under the scope of this License.
3. You may copy and distribute the Program (or a work based on it, under Section 2) in object
code or executable form under the terms of Sections 1 and 2 above provided that you also do one
of the following:
a) Accompany it with the complete corresponding machine-readable source code, which must
be distributed under the terms of Sections 1 and 2 above on a medium customarily used for
software interchange; or,
b) Accompany it with a written offer, valid for at least three years, to give any third party, for a
charge no more than your cost of physically performing source distribution, a complete
machine-readable copy of the corresponding source code, to be distributed under the terms
of Sections 1 and 2 above on a medium customarily used for software interchange; or,
c) Accompany it with the information you received as to the offer to distribute corresponding
source code. (This alternative is allowed only for noncommercial distribution and only if you
DSO4000 Series Digital Storage Oscilloscope
80
received the program in object code or executable form with such an offer, in accord with
Subsection b above.)
The source code for a work means the preferred form of the work for making modifications to it.
For an executable work, complete source code means all the source code for all modules it
contains, plus any associated interface definition files, plus the scripts used to control compilation
and installation of the executable. However, as a special exception, the source code distributed
need not include anything that is normally distributed (in either source or binary form) with the
major components (compiler, kernel, and so on) of the operating system on which the executable
runs, unless that component itself accompanies the executable.
If distribution of executable or object code is made by offering access to copy from a designated
place, then offering equivalent access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not compelled to copy the source
along with the object code.
4. You may not copy, modify, sublicense, or distribute the Program except as expressly provided
under this License. Any attempt otherwise to copy, modify, sublicense or distribute the Program
is void, and will automatically terminate your rights under this License. However, parties who have
received copies, or rights, from you under this License will not have their licenses terminated so
long as such parties remain in full compliance.
5. You are not required to accept this License, since you have not signed it. However, nothing
else grants you permission to modify or distribute the Program or its derivative works. These
actions are prohibited by law if you do not accept this License. Therefore, by modifying or
distributing the Program (or any work based on the Program), you indicate your acceptance of this
License to do so, and all its terms and conditions for copying, distributing or modifying the Program
or works based on it.
6. Each time you redistribute the Program (or any work based on the Program), the recipient
automatically receives a license from the original licensor to copy, distribute or modify the Program
subject to these terms and conditions. You may not impose any further restrictions on the
recipients' exercise of the rights granted herein. You are not responsible for enforcing compliance
by third parties to this License.
7. If, as a consequence of a court judgment or allegation of patent infringement or for any other
reason (not limited to patent issues), conditions are imposed on you (whether by court order,
agreement or otherwise) that contradict the conditions of this License, they do not excuse you
from the conditions of this License. If you cannot distribute so as to satisfy simultaneously your
obligations under this License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all. For example, if a patent license would not permit
royalty-free redistribution of the Program by all those who receive copies directly or indirectly
through you, then the only way you could satisfy both it and this License would be to refrain
entirely from distribution of the Program.
DSO4000 Series Digital Storage Oscilloscope
81
If any portion of this section is held invalid or unenforceable under any particular circumstance, the
balance of the section is intended to apply and the section as a whole is intended to apply in other
circumstances.
It is not the purpose of this section to induce you to infringe any patents or other property right
claims or to contest validity of any such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is implemented by public license practices.
Many people have made generous contributions to the wide range of software distributed through
that system in reliance on consistent application of that system; it is up to the author/donor to
decide if he or she is willing to distribute software through any other system and a licensee cannot
impose that choice.
This section is intended to make thoroughly clear what is believed to be a consequence of the rest
of this License.
8. If the distribution and/or use of the Program is restricted in certain countries either by patents
or by copyrighted interfaces, the original copyright holder who places the Program under this
License may add an explicit geographical distribution limitation excluding those countries, so that
distribution is permitted only in or among countries not thus excluded. In such case, this License
incorporates the limitation as if written in the body of this License.
9. The Free Software Foundation may publish revised and/or new versions of the General
Public License from time to time. Such new versions will be similar in spirit to the present version,
but may differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the Program specifies a version number
of this License which applies to it and "any later version", you have the option of following the
terms and conditions either of that version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of this License, you may choose
any version ever published by the Free Software Foundation.
10. If you wish to incorporate parts of the Program into other free programs whose distribution
conditions are different, write to the author to ask for permission. For software which is
copyrighted by the Free Software Foundation, write to the Free Software Foundation; we
sometimes make exceptions for this. Our decision will be guided by the two goals of preserving
the free status of all derivatives of our free software and of promoting the sharing and reuse of
software generally.
NO WARRANTY
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
DSO4000 Series Digital Storage Oscilloscope
82
OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.
SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR OR CORRECTION.
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR
DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL
DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING
BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO
OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest possible use to the public,
the best way to achieve this is to make it free software which everyone can redistribute and
change under these terms.
To do so, attach the following notices to the program. It is safest to attach them to the start of
each source file to most effectively convey the exclusion of warranty; and each file should have at
least the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software; you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program;
if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.
DSO4000 Series Digital Storage Oscilloscope
83
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this when it starts in an interactive
mode:
Gnomovision version 69, Copyright (C) year name of author Gnomovision comes with
ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software, and you are
welcome to redistribute it under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate parts of the
General Public License. Of course, the commands you use may be called something other than
`show w' and `show c'; they could even be mouse-clicks or menu items--whatever suits your
program.
You should also get your employer (if you work as a programmer) or your school, if any, to sign a
"copyright disclaimer" for the program, if necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into proprietary programs.
If your program is a subroutine library, you may consider it more useful to permit linking proprietary
applications with the library. If this is what you want to do, use the GNU Lesser General Public
License instead of this License.
DSO4000 Series Digital Storage Oscilloscope
84